The Marvels retcon title against a cinematic blue and red multiverse background.

The Marvels Retcon: Is Marvel Rewriting Captain Marvel’s MCU Future?

Marvel fans are questioning whether Marvel Studios plans to change the continuity established by The Marvels. The debate centers on Kelsey Grammer’s Beast, whose appearance in the film’s post-credits scene connected Monica Rambeau’s story to the X-Men universe.

Newer promotional material and discussion surrounding Avengers: Doomsday have raised questions about whether Marvel intends to revisit that setup. However, a change in a character’s appearance does not automatically mean the studio has erased an earlier story.

The The Marvels retcon debate ultimately comes down to what Marvel has actually changed, what the available evidence suggests, and whether the next chapter of the Marvel Cinematic Universe can connect these stories without rewriting established events.

Is Marvel Retconning The Marvels?

At this stage, the key question is whether Marvel Studios has deliberately revised the story of The Marvels or simply plans to present familiar characters differently. The distinction matters because a retcon changes how audiences understand previously established events, while a redesign can alter a character’s appearance without changing the story.

The Marvels retcon debate highlights the difference between changing a character’s appearance and rewriting an established MCU storyline.

Released in November 2023, The Marvels followed Carol Danvers, Monica Rambeau, and Kamala Khan as their powers became connected. The film also introduced a significant development in its post-credits scene: Monica found herself in an alternate reality associated with the X-Men films, where she encountered Beast.

That moment gave Marvel an opportunity to connect its existing superhero universe with characters from the earlier X-Men franchise. Consequently, any new development involving Beast could attract attention from fans who want to know whether the studio will continue that storyline.

However, the existence of a new design or a different presentation does not prove that Marvel has abandoned the earlier scene. The studio could preserve the original events while explaining the differences through another timeline, a separate universe, or a creative decision that does not affect continuity.

For now, the most accurate approach is to treat the alleged retcon as a theory rather than a confirmed development. A clear explanation from Marvel or an actual story development would provide stronger evidence than visual comparisons alone.


What Happened in The Marvels Post-Credits Scene?

The post-credits scene of The Marvels provides the foundation for the current discussion. Rather than ending Monica Rambeau’s journey with a simple return to her friends, the film placed her in an unfamiliar reality and introduced a character strongly associated with the X-Men franchise.

This development mattered for two reasons. First, it left Monica’s immediate future unresolved. Second, it created an opportunity for Marvel Studios to explore relationships between its established MCU characters and heroes from another cinematic universe.

The scene did not explain every detail of the alternate reality, nor did it reveal exactly how Monica would return. Instead, it established a new possibility for future storytelling.

That uncertainty leaves room for several interpretations. Marvel could continue the storyline directly, explain the differences between the universes, or take the characters in an unexpected direction. Until the studio provides further answers, audiences cannot know which approach it will choose.

Monica Rambeau Enters an Alternate Reality

Monica plays a crucial role in the ending because she becomes separated from the reality she knows. After helping Carol and Kamala resolve the film’s central crisis, Monica finds herself on the other side of an interdimensional barrier.

In this alternate reality, she encounters her mother, Maria Rambeau, who appears to have a different identity and role in that universe. The scene also introduces Beast, establishing a connection to the X-Men films.

This encounter raises an important question: how will Monica’s experience affect the wider MCU?

Her situation gives Marvel several possible narrative directions. The studio could explore the alternate reality in greater detail, use Monica to connect different groups of heroes, or make her return part of a larger multiverse conflict.

Nevertheless, the scene does not confirm what happens next. Its purpose is to establish an unresolved storyline, not to guarantee a particular crossover or future appearance.


Why Kelsey Grammer’s Beast Matters

Kelsey Grammer’s appearance as Beast carries significance beyond a brief cameo. The actor previously portrayed Hank McCoy in X-Men: The Last Stand and later returned for a post-credits appearance in X-Men: Days of Future Past. His presence in The Marvels therefore connected the MCU to a recognizable character from the earlier X-Men film series.

Beast also represents a useful bridge between the franchises. As a scientist and mutant, Hank McCoy can contribute both intellectual expertise and a connection to the X-Men’s history.

His appearance alongside Monica suggested that Marvel could bring familiar characters into its multiverse storytelling without immediately rebuilding their entire histories within the main MCU timeline.

That possibility helps explain why fans pay attention to changes in his appearance. If Marvel presents Beast differently in later material, viewers naturally want to know whether the change reflects a different point in his life, an alternate version of the character, or a broader revision of the franchise’s continuity.

Still, Grammer’s return alone does not establish that Marvel has retconned anything. The important evidence will come from how the studio handles the character in the story itself.


What Sparked the The Marvels Retcon Debate?

The theory gained attention because fans began comparing Beast’s appearance in The Marvels with newer material associated with Marvel’s upcoming crossover plans. Differences in styling, clothing, and overall presentation can encourage speculation, particularly when a character connects two major superhero franchises.

However, these comparisons need context. Film productions often change character designs to reflect a different setting, creative direction, or stage in a character’s life. Promotional artwork and merchandise can also differ from the final presentation on screen.

The larger multiverse storyline creates another complication. Marvel can feature familiar characters in separate realities without requiring every version to share an identical history. Therefore, a different portrayal could fit within the franchise’s existing storytelling approach rather than contradict it.

Fans also have broader questions about Marvel’s future direction. With Avengers: Doomsday bringing together characters from different corners of the superhero franchise, viewers are watching for clues about which earlier storylines will receive attention.

Nevertheless, three possibilities should remain separate:

  • A character redesign: Beast looks different, but his established history remains intact.
  • A multiverse explanation: The character belongs to a different reality or represents a different version of Hank McCoy.
  • A genuine retcon: Marvel explicitly changes or contradicts information established in an earlier film.

For now, the The Marvels retcon theory remains unconfirmed, and fans will need clearer evidence before drawing a firm conclusion.

Only the third possibility would establish a true continuity revision. Until the film or an official statement clarifies the situation, the alleged The Marvels retcon remains unconfirmed.


Does the X-Men Multiverse Explain the Difference?

The multiverse offers a straightforward way to explain why familiar characters might appear differently across Marvel films. Rather than requiring every character to share one uninterrupted history, the concept allows separate realities to contain different versions of the same person.

The Marvels already uses this idea. Monica Rambeau wakes in a reality where Maria Rambeau is alive and has become a superhero known as Binary. Beast’s presence further connects that world to the X-Men franchise. The scene therefore establishes that Monica has crossed into a reality different from her own. <Cite refs={[“turn576025search6″,”turn576025search8”]}/>

That detail matters when evaluating the redesign theory. If Avengers: Doomsday presents Beast in another context, Marvel could explain the differences through his circumstances, experiences, or universe. The character would not necessarily need a completely rewritten history.

There is another possibility: the two appearances could depict the same character at different points in his life. A change in clothing or physical presentation would not automatically contradict the events of The Marvels.

Of course, the multiverse should not become an excuse to dismiss every continuity question. If a later film directly contradicts an earlier scene without offering a reasonable explanation, audiences would have grounds to question the consistency of the story.

For now, the multiverse provides a plausible explanation, not a confirmed answer. The strongest conclusion is that Marvel has several ways to reconcile the appearances if it chooses to continue Monica’s storyline.

What Marvel Has Actually Confirmed

Separating official information from speculation is essential to understanding the The Marvels retcon debate.

Marvel Studios has confirmed Kelsey Grammer’s involvement in Avengers: Doomsday. Official Disney materials also identify the film as a crossover featuring characters from multiple superhero groups and universes. However, the announced cast and broad premise do not establish that Marvel intends to erase the post-credits scene of The Marvels. <Cite refs={[“turn576025search0″,”turn576025search2”]}/>

The available promotional designs provide evidence of a different visual presentation for Beast. They do not, by themselves, reveal whether the character belongs to the exact reality Monica visited or whether the film will explain the difference.

Similarly, the absence of an announced appearance by a particular character does not prove that Marvel has abandoned that character’s storyline. Studios can keep plot details and casting information under wraps, especially for large crossover films.

Here is the distinction:

Claim What the evidence supports
Kelsey Grammer is returning as Beast Confirmed by official cast information
Beast has a different promotional design Supported by available promotional material
Marvel has officially retconned The Marvels Not established by the cited evidence
Monica’s storyline has been permanently abandoned Not confirmed
A multiverse explanation remains possible A reasonable interpretation, not a confirmed plot detail

Ultimately, the evidence supports a discussion about a possible continuity change, not a definitive claim that one has occurred. A direct statement from Marvel or an explanation within the film would provide much stronger grounds for that conclusion.


What Does The Marvels Retcon Mean for the MCU?

The term retcon refers to a change in how a story treats previously established events. A filmmaker might introduce new information that changes the audience’s understanding of an earlier scene, revise a character’s history, or contradict a detail that once appeared definitive.

In the case of The Marvels, a genuine retcon would involve Marvel Studios changing the meaning or continuity of Monica Rambeau’s encounter with Beast. Simply giving Beast a different costume, hairstyle, or physical presentation would not meet that standard.

For example, Marvel could reveal that the Beast Monica encountered belongs to a different reality than viewers initially assumed. That explanation would add information to the existing story rather than erase the scene. Alternatively, a later film could explicitly contradict an established detail about that encounter, which would provide stronger grounds for calling the change a retcon.

The distinction matters because the MCU has increasingly used alternate realities to bring together characters from different film franchises. Marvel’s official multiverse material describes a collection of distinct worlds, allowing familiar characters to have different histories across separate realities.

However, the existence of a multiverse does not automatically explain every difference. The eventual story still needs to establish which reality a character occupies and how that reality connects to previous events.

Until Marvel provides that explanation, the most accurate description is a possible continuity change rather than a confirmed The Marvels retcon.

Retcon vs. Redesign vs. Alternate Timeline

These three concepts can look similar from the outside, but they serve different purposes in storytelling.

Concept Meaning How it could apply to Beast
Retcon Changes or contradicts previously established story information A future film explicitly revises the meaning of Monica’s encounter
Redesign Changes a character’s visual presentation Beast appears with different clothing or styling
Alternate timeline Places a character in a distinct version of reality or history A different Beast has a separate background and experiences

A redesign generally affects how a character looks. An alternate timeline can change what happened to that character. A retcon, meanwhile, changes how an earlier story fits into the narrative.

These categories can overlap. A film could introduce a redesigned version of a character from an alternate timeline while also revising an earlier continuity detail. Nevertheless, the evidence must support each claim separately.

For the current debate, the visible design differences are the easiest to identify. The claim that Marvel has deliberately abandoned The Marvels requires additional evidence that the appearance alone cannot provide.


Could Marvel Avoid a The Marvels Retcon?

Marvel Studios can preserve The Marvels‘ events while taking Beast’s story in a new direction. The film already establishes that Monica Rambeau has entered an alternate reality, allowing the studio to continue her journey without rewriting her original experience.

One option is to explore Monica’s life in this unfamiliar universe. A future film could show her building new relationships and searching for a way home, with Beast remaining part of the storyline even if his appearance or circumstances change.

A The Marvels retcon would become more plausible if a future film directly revised an event established in the original story. Until then, changes to individual characters do not necessarily indicate that Marvel is erasing previous events.

Another possibility is to introduce a different version of Beast from another universe. The MCU’s multiverse framework allows alternate versions of familiar characters to have different histories and appearances.

Marvel could also postpone Monica’s storyline while focusing on other characters. Leaving a plot thread unresolved does not automatically mean the studio has abandoned it.

However, these possibilities remain theories rather than confirmed plot details. Marvel has not officially clarified exactly how Avengers: Doomsday will address Monica’s situation.

For now, the most reasonable interpretation is that The Marvels can remain part of MCU continuity even if Beast’s next appearance takes a different direction. The studio may only need to clarify how the characters and their respective realities connect when the story calls for it.


How Marvel’s Earlier Stories Handled Continuity Changes

The MCU has already demonstrated that characters and storylines can evolve as the franchise expands. However, not every change represents a retcon. Some developments add missing context, while others introduce alternate versions of familiar heroes.

Doctor Strange in the Multiverse of Madness, for example, brought Patrick Stewart back as Professor Charles Xavier in a universe different from the main MCU setting. The appearance connected audiences with the earlier X-Men films while presenting Xavier within a separate reality.

Similarly, Deadpool & Wolverine brought together characters and references from the Fox-era Marvel films and the wider Marvel franchise. Its multiverse approach demonstrated how Marvel could revisit familiar characters without requiring every earlier film to fit neatly into one uninterrupted timeline.

These examples provide useful context for the Beast debate. Marvel can acknowledge earlier portrayals, introduce familiar actors, and create new relationships between franchises without automatically rewriting the original films.

At the same time, multiverse storytelling can create confusion when a movie leaves important connections unexplained. Audiences may struggle to determine whether they are watching the same character, a variant, or a deliberate revision of earlier events.

That is why the distinction between an addition and a contradiction matters. An explanation that expands an earlier story is not necessarily a retcon. A direct revision of established facts is a different matter.

For The Marvels, the question is not whether Marvel can change direction. It is whether the studio will explain Beast’s role in a way that respects the story already shown.


Why Post-Credits Scenes Matter to the MCU

Post-credits scenes have long helped Marvel Studios connect individual films to larger storylines. They can introduce a new character, reveal an unexpected consequence, or suggest where a future adventure might lead.

The scene involving Monica and Beast served precisely that purpose. It connected Monica’s unresolved situation to the X-Men universe and gave Marvel a potential route toward a larger crossover.

However, a post-credits scene does not guarantee that the next movie will immediately continue its storyline. A studio may develop the setup later, change the order of its planned projects, or leave certain questions unanswered while other events take priority.

This creates a difference between an unresolved plot thread and an abandoned one. The first simply lacks a conclusion at the moment. The second would require stronger evidence that the studio no longer intends to pursue it.

In the case of The Marvels, Monica’s encounter established a narrative possibility, but it did not promise a specific appearance in Avengers: Doomsday. Likewise, a change in Beast’s presentation does not automatically invalidate that scene.

Ultimately, post-credits scenes are invitations to consider future possibilities, not guarantees of a particular outcome. The most reliable way to judge the current theory will be to examine what Marvel actually shows and explains in its subsequent films.


Did The Marvels‘ Box Office Performance Influence the Retcon Theory?

The Marvels‘ box-office performance has fueled discussions about the film’s future, but commercial results do not prove a continuity change. Released in US theaters on November 10, 2023, the film earned approximately $206.1 million worldwide, falling short of several earlier MCU releases.

Although these results may influence Marvel Studios’ priorities, they do not confirm plans to rewrite the film’s story, reduce Captain Marvel’s role, or abandon Monica Rambeau’s storyline.

Some fans interpret changes in promotional material or missing characters from casting announcements as signs of a creative shift. However, there is no established evidence connecting the film’s financial performance to the alleged retcon.

Marvel must balance multiple franchises and characters, especially in ensemble projects such as Avengers: Doomsday. Giving certain characters more attention in one film while exploring others later does not mean earlier events have been erased.

Ultimately, The Marvels‘ box-office performance provides commercial context for the debate, but it does not prove that Marvel intends to retcon the film. Reliable confirmation would be needed to support that claim.


What the Controversy Could Mean for Captain Marvel

The debate extends beyond Beast because The Marvels established important developments for Carol Danvers and Monica Rambeau. Both characters have unresolved narrative possibilities, and their futures matter to viewers following the MCU.

Carol’s journey in The Marvels focused on the consequences of her earlier actions, her relationship with the Kree, and her efforts to repair the damage associated with the Supreme Intelligence. The film also strengthened her relationship with Monica and introduced her to Kamala Khan as a fellow superhero.

Meanwhile, Monica’s disappearance created a direct connection to the X-Men universe. Her encounter with Beast offered Marvel a way to connect characters from different franchises without immediately resolving every detail.

A change in Beast’s appearance does not automatically invalidate either character’s story. Even if Avengers: Doomsday takes a different direction, Marvel could continue Carol’s development in one storyline while resolving Monica’s situation through another.

The more important question is whether the studio gives these characters meaningful follow-through. Viewers do not necessarily need every plot thread resolved in the next crossover, but unresolved setups can become frustrating when later stories ignore them without explanation.

At present, the alleged retcon does not establish that Marvel has abandoned Captain Marvel or Monica. Their future appearances and narrative roles should be judged through confirmed announcements and the films themselves, rather than assumptions based on Beast’s design.

Carol Danvers’ Place in the MCU

Carol Danvers remains an important MCU character because her powers and experiences connect Earth to threats beyond its immediate surroundings. In The Marvels, she confronts the consequences of her actions while learning to work alongside Monica and Kamala.

That development leaves room for future stories about responsibility, leadership, and the relationships she has rebuilt. However, a character’s importance to the larger franchise does not guarantee a place in every Avengers film.

Marvel’s upcoming crossover features a large ensemble of returning characters. As a result, fans should not assume that a character’s absence from a particular announcement confirms their exclusion from the wider franchise.

Similarly, claims that Marvel intends to sideline Carol because of The Marvels‘ commercial performance remain speculative without supporting evidence.

The sensible approach is to distinguish confirmed casting information from predictions about the next chapter. Carol’s future remains open to discussion, but speculation should not be presented as established news.

Monica Rambeau’s Unresolved Story

Monica’s ending in The Marvels offers one of the clearest reasons for the retcon debate to continue. She finds herself in a different reality, encounters a version of her mother, and meets Beast. The sequence creates an unresolved situation that could connect her personal journey to a broader multiverse conflict.

Marvel could use Monica’s experience to explore the emotional consequences of living in a world that resembles her own but differs in important ways. Her reunion with Maria also raises questions about identity, loss, and the temptation to remain in a reality that offers something she no longer has at home.

Beast’s presence provides a potential connection to the X-Men, but it does not determine how Monica’s story must unfold. She could remain in that reality for an extended period, seek help from its inhabitants, or eventually find a route home.

None of these outcomes requires Marvel to erase the original film. Each could build directly on its ending.

Until the studio reveals more, Monica’s future remains unresolved rather than definitively abandoned. That distinction is central to evaluating whether Marvel has genuinely retconned The Marvels.


Could Avengers: Doomsday Move Beyond The Marvels?

Avengers: Doomsday brings together characters from several corners of Marvel’s cinematic universe, making it a natural opportunity to explore connections between the Avengers, the Fantastic Four, and the X-Men.

Marvel’s evolving crossover plans also raise questions about how earlier MCU stories connect with upcoming Avengers films. Read our guide to Avengers: Endgame Encore and its Doomsday connection for more context on the franchise’s next chapter.

However, a large crossover cannot give every character and storyline equal attention. The film must establish its central conflict while balancing the motivations, histories, and relationships of a substantial ensemble.

Marvel could focus on the main threat while leaving Monica’s situation for a later installment. It could also use the multiverse conflict to explain how characters from different realities interact. Either approach would allow the studio to prioritize the new film’s central story without necessarily discarding The Marvels.

There is an important difference between moving beyond a storyline and rewriting it. A film can introduce new priorities, shift attention to other characters, or postpone an explanation without contradicting what came before.

However, if Avengers: Doomsday directly establishes that the events of Monica’s post-credits scene occurred differently from what audiences saw, the retcon argument would become more substantial. The key evidence would be the movie’s actual narrative, not the absence of a character from promotional material.

For now, Marvel’s multiverse storyline makes several outcomes possible. It does not establish which direction the filmmakers have chosen.


Three Possible Outcomes for the Retcon Debate

The current evidence supports several possible explanations for the Beast controversy. None should be treated as confirmed until Marvel clarifies the character’s role in the story.

1. Marvel Keeps the Original Continuity Intact

Beast could retain the history implied by his appearance in The Marvels, while a different costume or presentation reflects his circumstances in the upcoming film. Under this scenario, the visual changes would not constitute a retcon.

This would be the simplest explanation because it would allow Marvel to continue the existing storyline without revising established events.

2. Marvel Introduces Another Version of Beast

The character in Avengers: Doomsday could belong to a different reality or have a different personal history. Such an explanation would fit the franchise’s multiverse framework, although the film would need to establish the relevant details.

This possibility would let Marvel explore a different interpretation of Beast while preserving Monica’s original encounter.

3. Marvel Explicitly Revises Earlier Continuity

The studio could eventually reveal that a previous detail no longer applies or that an earlier scene has a different meaning than audiences initially understood. That would provide stronger grounds for describing the development as a genuine retcon.

Such a decision would require more than a redesigned costume or a different promotional image. The story would need to revise or contradict information that the earlier film established.

These possibilities have different implications. The first requires no major continuity change, the second expands the multiverse story, and the third revises established information.

At present, the available evidence does not establish which outcome Marvel will choose. A responsible analysis should therefore distinguish visible design differences from confirmed story developments.

The eventual explanation may be straightforward, but the answer depends on what the film actually reveals rather than what fans infer from promotional material.


Is The Marvels Retcon Actually Happening?

The question of whether Marvel Studios is retconning The Marvels remains unresolved. The main reason for the debate is the difference between Beast’s appearance in the film’s post-credits scene and his newer promotional presentation. However, a visual change alone cannot establish that Marvel has rewritten its continuity.

The available evidence does not yet prove that the The Marvels retcon theory reflects Marvel Studios’ actual plans.

The original film introduced a meaningful connection between Monica Rambeau and the X-Men universe. Monica’s encounter with Beast suggested that Marvel could explore relationships between characters from different cinematic franchises. Nothing about a different costume or character design automatically cancels that development.

Several explanations remain possible. Marvel could preserve the original continuity, introduce a different version of Beast, or eventually revise an earlier story detail. Each outcome would have different implications for the MCU, but none should be presented as confirmed without stronger evidence.

The film’s commercial performance also does not prove that Marvel intends to abandon its storylines. Financial results may influence a studio’s priorities, but a direct connection between box-office performance and a specific continuity decision requires evidence.

Ultimately, the strongest conclusion is that the The Marvels retcon theory remains speculation. Fans have legitimate reasons to question how Marvel will handle Beast’s return and Monica’s unresolved story, but the studio’s actual narrative decisions will determine whether a retcon has occurred.


Frequently Asked Questions

Is Marvel officially retconning The Marvels?

There is no established confirmation that Marvel Studios has officially retconned The Marvels. Differences in Beast’s appearance have encouraged speculation, but a redesign does not automatically change the story. Marvel would need to revise an established event or provide a clear explanation that contradicts the original film before the claim could be treated as confirmed.

Why does Beast look different in Avengers: Doomsday?

Beast’s newer promotional presentation differs from his appearance in The Marvels. However, the available visual differences do not establish why the design changed. The filmmakers could have chosen a new look for creative reasons, or the story could explain the difference through the character’s circumstances. Until the film clarifies the situation, any specific explanation remains speculative.

Is Kelsey Grammer returning as Beast?

Yes. Kelsey Grammer is returning as Beast in Avengers: Doomsday. His involvement connects the upcoming crossover to his earlier appearances in the X-Men films and his cameo in The Marvels. However, his return alone does not establish whether the character will continue the exact storyline introduced in the post-credits scene.

What happened to Monica Rambeau at the end of The Marvels?

Monica becomes trapped in an alternate reality after helping Carol Danvers and Kamala Khan resolve the film’s central crisis. In that universe, she encounters a version of her mother, Maria Rambeau, and meets Beast. The scene leaves Monica’s future unresolved and creates an opportunity for Marvel to explore connections between the MCU and the X-Men universe.

Does The Marvels remain part of MCU canon?

The alleged retcon does not establish that The Marvels has been removed from MCU continuity. The film remains part of the franchise’s released cinematic history, and a later character redesign does not automatically erase its events. Whether Marvel revises any specific detail will depend on how future films handle the story.

Did The Marvels’ box-office performance cause the alleged retcon?

There is no established evidence that the film’s commercial performance caused Marvel Studios to change its continuity. Box-office results can influence a studio’s business decisions, but they do not independently reveal the reasons behind a creative choice. Without reliable confirmation, connecting the film’s earnings directly to the alleged retcon would be speculation.

Will Captain Marvel return in Avengers: Doomsday?

Captain Marvel’s future should be discussed using confirmed casting information and official announcements. The existence of a major Avengers crossover does not, by itself, confirm every character’s participation. Likewise, uncertainty about Carol Danvers’ next appearance does not prove that Marvel has abandoned the character or her storyline.


The Bigger Picture for Marvel’s Multiverse

The debate surrounding The Marvels highlights a wider challenge for Marvel Studios: maintaining continuity while expanding its cinematic universe across different realities and generations of characters.

Beast’s return creates an opportunity to connect the X-Men franchise with the MCU, while Monica Rambeau’s unresolved situation provides a potential route into further multiverse storytelling. However, a different character design does not necessarily signal a change in the underlying narrative.

Marvel’s next crossover also raises questions about how earlier MCU stories will connect with future events. Explore our coverage of Avengers: Endgame Encore and its Doomsday connection for more insight into the franchise’s evolving storyline.

For now, fans should distinguish confirmed developments from theories about Marvel’s future plans. The most important evidence will come from the story itself. Until then, the alleged The Marvels retcon remains an open question rather than an established fact.