As ações do Capitão América no final do fim de jogo contradizem o que ouvimos antes no filme? [duplicado]

Não necessariamente. Duas coisas a ter em mente:

Primeiro, foi revelado que Peggy Carter havia se casado algum tempo após a Guerra Mundial 2, mas seu marido não era nomeado nem foi visto em seu funeral, nunca foi mencionado se ele ainda estava vivo ou não.

Segundo, não há realmente nada mostrado sobre a SHIELD e Carter dos 1950s aos 1990s, além de breves flashbacks e referências.

Então, você está olhando para um loop fechado.

Rogers returns the Infinity Stones but he doesn't go back to right after his disappearance in 1945; he goes back sometime later, after the years shown in the Agent Carter series, because he knows what she was up to during those years and that his being missing is part of the reason she did the things she did, and what she did was important for events later. Then he shows up, say, in 1950 or so. Maybe he tells her the truth, maybe he just tells her he miraculously survived and just made his way back to civilization from the crash, but he wants to get away from the life and retire.

Então ele assume uma identidade falsa e casa com ela.

He knows about HYDRA infiltrating SHIELD, but doesn't say anything because he knows events have to play out, and he carefully plays the role of husband not involved with the secret agent life.

Peggy começa a desenvolver Alzheimer e está bem na fase de demência quando

his past self, still frozen in ice, is found. At that point, he has to be careful not cross paths with his younger self, so he avoids visiting her when he knows his younger self will be there, sits quietly in the back at her funeral, and then waits to reveal himself to Bucky and Sam after his younger self has made the jump back in time.

Eu não acho que o Capitão América viva sua vida em nossa realidade. Semelhante a como as pedras foram tiradas em uma realidade diferente, ele simplesmente foi até lá e mexeu ainda mais com a linha do tempo.

Aqui estão as razões pelas quais acho que isso deve ser verdade.

1. Qualquer outra coisa seria contrária a todas as regras de viagem no tempo estabelecidas no filme
2. O Capitão América sabe que Becky está viva e a SHIELD está inter-relacionada por Hydra. Estou certo de que, em sua nova realidade, ele corrige essas duas coisas, mas não na nossa.

Depois, ele volta para nós de alguma maneira. Talvez ele consiga mais Pim [partículas de sua versão do Dr. Pim em algum momento. Talvez o Feiticeiro Supremo o ajude. Ele a conhece para devolver a Pedra do Tempo.

A única pergunta é por que ele não volta à plataforma? Isso deve ser apenas para um efeito dramático. Ele teve uma vida inteira para planejar esse momento.

EDIT:

Antes que alguém diga que Cap não mexeria na linha do tempo, se ele voltasse ao nosso tempo, ele mostrou claramente que não se importa com isso. Se ele se arriscasse a mudar algo só para si, desafiadoramente teria mudado as coisas para impedir que seu melhor amigo fosse torturado.

Situação confusa

This situation is confusing because Endgame uses a version of time travel that's not often seen in science fiction, especially movies or television. Endgames time travel is based on the multi universe theory and isn't really time travel, it's more like jumping to a universe that's running a bit behind your own

Como tudo funciona

This version of time travel is the one used in the book Timeline written by the late Michael Crichton. I highly recommend it, and it does a very good job of explaining how multi universe "time travel" works. It's also a movie Timeline Movie, but if I remember correctly they screw up how Crichton's time travel works.

O que isso significa no final do jogo

So a short explanation of the time travel in Endgame. When the team goes back to 2012 they didn't travel back in time in their own universe, they traveled to a different universe that happens to be identical to the one they started from, except it's 7 years earlier there. This is how removing the stones from that time can't effect the present in the original universe. Interestingly this means that the stones taken from Asgard and the ones that Rhodes, Nebula, Barton, and Natasha take are from different universes as well. So one universe only loses a max of 2 stones (note that Tony and Cap get the Tesseract from a different universe).

Respondendo sua pergunta

Now that's out of the way, what's going on with old Captain America. This is >!where it gets a bit tricky. As Keith Morrison mentioned in his answer Peggy >!Carters husband is never named in previous films. Which means that the old >!Captain America seen in Endgame was probably her husband all along in the >!movie universe and avoided notice as Keith describes. However this is not a >!closed loop. Old Captain America is from a different universe. One that was >!exactly identical to the movie universe but ~70 years ahead of the one in the >!movie. In fact if the characters were to check his "quantum signature" or >!some such thing they'd probably be able to identify he wasn't from the movie >!universe.
The Cap who went back in time will never return to the movie universe. He'll >!live out his life in the universe he jumped to for Peggy.

O presente dele

Regarding the shield that old Captain America has with him. Perhaps in the >!universe he came from it either wasn't destroyed or was rebuilt before he went >!back, so he took it with him when he returned the stones. Of course he >!wouldn't know that it was destroyed and not present in the movie universe.

Que faixa menciona

To tie this back to what Banner said earlier in the movie about killing baby >!Thanos. He was right and wrong. They could kill baby Thanos and stop the >!snap, it just wouldn't be in their universe. In fact they could spend years >!committing baby Thanos genocide in many other universes and saving them from >!the snap, but never their own. Of course that might have other undesirable >!outcomes for those universes, for instance if Thanos never existed, would the >!Guardians of the Galaxy have formed? And if they didn't could Quill of >!stopped his father Ego? All life becoming Ego is arguably worse than the >!snap.

spoilers finais

Depois de pensar um pouco sobre isso, minha teoria pessoal é que

The elderly Captain America is from a different (though similar) timeline

Sabemos que

the timeline Captain America went back to already has changes made to it that simply returning the infinity stones won't change (Loki's escape being the most obvious, but also things like Peter Quill being knocked out, Thor's hammer being pulled away from him while on Asgard, or HYDRA agents hearing Cap say "Hail Hydra"). But these changes are all relatively minor - they won't cause the millions of deaths that the Ancient One warned would result from actually removing an infinity stone from the timeline.

Assim,

that timeline will be slightly altered, but its events will largely be the same. Thanos or someone similar will still gather the stones, and in 2019 heros will likely travel back in time themselves to set things right. This will change events in other ways, creating yet another timeline slightly altered from their own. In essence, we see a cycle of slightly-different timelines being forked off over and over.

Mas

how do we know our timeline is the first one in the cycle? More likely, heroes from years the future came back to this one, stealing the infinity stones and returning them, and in doing so changed things in subtle ways from their "original" timeline. Maybe in their timeline Yondu's still alive, or Vision is monochrome, or heck, maybe the earth was saved at some point by a talking duck from outer space.

O ponto principal aqui é

the elderly Steve we see at the end is from that timeline, and has come back to our, forked timeline to live out his life, just like our Steve went back to the newly-forked timeline where Loki escaped. This is consistent with the MCU's rules of time travel - you still can't change your present, only create alternate timelines. But since people in the alternate timelines can themselves go back in time, there's no reason not to think that we were in an "alternate timeline" to begin with.

Para citar outra franquia,

All of this has happened before, and all of this will happen again.