Strictly speaking, did Steve really even *need* to put the Soul stone back when he was returning all the others?
Oddly enough, this occurred to me in the shower earlier today, of all places. But so like the whole idea was, thanks in part to the chat that Bruce has with the Ancient One, they're worried of all these branches of alternate realities being allowed to fester and grow from where the Avengers take the stones in the middle act of END GAME. But does that really need to also be the case for the Soul stone in particular? I mean you could even say that it's *meant* to be taken, by someone, anyway. It doesn't have some active purpose in the current spot it is, at Vormir. There's even this special "rule" that's established for anyone who wants to try to take it. And we know that it's not like it being put back is going to reverse or undo Natasha's death anyway, she's gone no matter what. If anything, arguably what Thanos does at the start of EG is way worse, because he takes it off the board entirely (along with all the rest), if Steve never physically puts it back there it's still existing within the bounds of the universe.
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You’re very very silly.
The Russos have even explained it. When you go back in time, you create a different timeline. It's not a loop.
"I'm sorry, I can't help you, Bruce. If I give up the Time Stone to help your reality, I'm dooming my own."
"The Infinity Stones create what you experience as the flow of time. Remove one stone and that flow splits. Now, this may benefit your reality but my new one, not so much. In this new branched reality, without our chief weapon against the forces of darkness, our world will be over run. Millions will suffer. So, tell me Doctor, can your science prevent all that?"
Kinda vague. I didn't take it to mean the world was automatically unstable.
But the idea is that they should cause the least disturbance possible to the timeline because there's no way to know how even the slightest change could have a butterfly effect and cause a bigger problem down the line. (granted it's no longer 100% possible due to Loki teleporting away and Thanos chasing after them)