Enhance
Administrator
I think I can sort of work out their logic but it's messy if you try to extrapolate it too far.I don't think it is possible. First of all, it would be totally out of character, wouldn't it? If he stayed in the same timeline (which he did because he showed up as an old man), then all the things in this timeline happened and he just...let them happen? Like he just chills while HYDRA infiltrates SHIELD? Second, he wouldn't stay in the same timeline because he'd be changing stuff and making divergent realities by staying back there wouldn't he?
The theory is you can't change the past to adjust your future because your future is your past, and your past is your future. You can't alter your own reality in any way. That's why they bring everyone back to the current MCU time line instead of trying to stop the Snap. It already happened, in their reality, so they can't change that and bring people back because it starts a new reality. So, to fix this, they set up the relatively simplistic rule (let's call it The Stone Rule) that if the stones get returned to the exact point in time that they were taken, then literally nothing else will matter and life will go on. (It feels like an arbitrary rule but there you have it).
So, if Cap goes back and returns all of the stones to the exact moment they were taken, presumably with Peggy being his last stop, then he fulfilled the requirement to put the stones back and thus not create a new reality. In theory, his staying with Peggy can't impact anything negatively because of The Stone Rule.
What makes it messy is this - while Avengers and Civil War was happening, was there a Cap quietly enjoying retirement? Also, since ~2013 Thanos jumped forward several years to the current MCU timeline, that Thanos won't be able to cause the Snap, so haven't they ultimately created a new reality out there? I personally think they did, but maybe we're meant to consider that as being acceptable because Thanos sucks and we just saved this other reality from his terror? But, without that happening, then the current reality couldn't have ever happened. It suggests that there are several other realities that may not play out like the one we're experiencing as fans.
:frenchy
Edit: I just read another explanation out there about The Stone Rule that suggests yes, in fact, there are other realities out there because the Ancient One says "my" reality and "your" reality. In that Ancient One's reality where Hulk meets her, they subsequently lose a stone to Loki when he disappears, since that stone is in the Tesseract. They do take the Time Stone out of that reality, though. But, because the Space stone is in the tesseract, and it stays in that universe with Loki, then it's all sort of OK until the Time Stone returns.
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