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Originally Posted by TheyCallMeBruce
This explains the parallel reality time travel very well.
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I don't really buy that. First, they explain at the start of the whole time travel plan that the timeline is self-correcting, if they went back to kill Thanos someone else would have just taken his role, so just by going to the past wouldn't automatically spawn a new reality. Second, the Ancient One plainly states that it's only when an infinity stone is removed from a timeline that an alternate reality is created, and if they get returned then the timelines revert back to a single thread
I actually think his 2nd time travel method is the more likely one, immutable time travel. That explains Steve going back and marrying Peggy, that was always going to happen and there has always been an older married Steve in hiding during the entire MCU. The only hole in this theory is the younger Thanos leaving his timeline to go to the future and then dying, but I think that can be explained away with the Soul stone. When Steve returns it, Red Skull could state that by doing so all the souls it holds will be released, so Thanos and co. get unsnapped and that timeline merges back with the main one
I think the only timeline that is still separate from the main MCU is Loki with the Tesseract, which will probably be what the TV series will cover. I wouldn't be surprised though if by the end of that, he ends up returning the tesseract from the timeline he took it and everything merges back to a single thread