So now that it's confirmed that old cap just came back from an alt timeline instead of a loop whose to say he didn't...

So now that it's confirmed that old cap just came back from an alt timeline instead of a loop whose to say he didn't try to stop 9/11 or other atrocities?

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>stop 9/11
War in the Middle East likely doesn't happen, which means Tony Stark never gets captured and held prisoner in the middle east, never becomes Iron Man, and likely stays a drunken, care-free playboy until Shane bumps him off.

Sure but whose to say he doesn't free the Alt-Timeline Bucky stopping Bucky from killing Tony's parents and being an uncle figure to child Tony ensuring that alt-tony ends up different from the main timeline,

>ensuring that alt-tony ends up different from the main timeline,
Because a different Tony might not be able to handle what 'our' Tony could in order to be an Avenger.

So, it's a different Cap, then? How did he just happen to age/appear in the same dimension as the rest of the crew? Wouldn't each dimension's progress be different, since Cap got with Peggy? Wouldn't Peggy have mentioned it in Winter Soldier instead of the 'you never came back' bit?

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It's the same main timeline cap, he had a return device to take him back to when he left the whole time, when he went back to Peggy he made a timeline so main timeline Peggy still grew old and got married with someone else.

Makes sense.
...Wait, wouldn't Cap return to the platform if he used the time GPS?

see now that's where things get a little fucky yeah he should be able to return to the platform but I like to think that maybe in the alternate timeline at that time my tank pimp and Tony and Howard were able to make a time machine of their own since we know from the movie that when they travel through time they don't exactly end up on a platform so maybe by using return device they were able to reverse engineer a time machine

His timeline would have diverged so much by the time that happened in our reality that it's doubtful that he'd even NEED to stop it. But if it did, it'd probably be some Neo Hydra plot and I'm sure he'd come out of retirement with Peggy to prevent it.

Taking the stones created alternate timelines, putting them back erased the alternate timelines. Cap aged in the main timeline. Seems pretty straightforward to me, or at least as straightforward as time traveling can get.