This meshes with my line of thought. As old Cap doesn't return via the platform, but seems to be part of the main timeline anyway. This is how I imagine it playing out:
-Traveling back in time means you were always part of the main timeline, unless you drastically alter course. 2012 Loki escaping, Thanos & Friends leaving 2014 entirely, these create new branches.
-Cap is able to navigate these new branches in order to return the stones.
-Goes back further before any possible branching to be with Peggy, doesn't do anything to interfere with established events and remains in the main timeline. So yes, he was always Peggy's husband.
The main issue being why doesn't Cap interfere with things like Bucky, Hydra within SHIELD etc.. Well, he would for sure create a new branch, which he may ultimately doom by stepping out of line. They have failures, but end up saving countless lives with the way things play out, the stakes are too high to risk. He wanted a life and got one, knowing things will be all right.
This is sloppy because how do you define "drastically alter course" the mere presence of a time traveler, would likely set off a chain of events that lead to the timeline ultimately taking a different course. Is the universe just observing every situation and saying "nah you know what, this universe is 'close enough' to this other universe that I'm going erase all these people from existence.
For example, alternate Jane foster was attacked by a space Raccoon. that's a life experience that could eventually lead to some very different things happening in that timeline. Maybe this puts her In different place when the dark elves arrive, or puts Asgaurd on high alert, so they are better prepared for the attack.
Same With Alternate Quill, he got knocked the fuck out prior to getting the powerstone. Who know what the chain reaction of this would be going forward. Would this leave him in a bad spot when Ronan's guy shows up for the Stone?
Same with the 1970 timeline. Even though cap returned the Stone, shield suffered a security breach, and would likely be trying to figure out wtf happened. What if the investigation lead to some security protocols that ended up changing how they do business, ultimately preventing/causing things that would have occurred differently otherwise. Hell, what if they look at security footage, and see the tesseract being taken, then replaced moments later by Cap. That's not insignificant!
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