system
Given the following post, respond as if you're commenting on Reddit:
human
[Avengers Endgame]: Ok, so Cap took the infinity stones back to their universe, but what about the "hard cases"?

Some "infinity returns" are obvious:

* Time stone is easy - he gives it to the Ancient One.

* Space stone is also easy - he gives it to Asgard.

* Reality Stone is kinda easy - hand it off to Asgard and let them dump it on the Collector's doorstep for stupid.

* Mind Stone is mostly easy - he finds a way for it to get used to make Vision.

But some "infinity returns" are less clear regarding who should receive it:

* Soul Stone had no owner... does he just chuck it on the ground somewhere? Give it to the Ancient One? Use it to make really nice chicken soup?

* Power Stone is harder - is he just going to hand it off to a non-existent Thanos in that universe? Drop it on the ground on Xandar? Where the hell is this stone going? Should he just give it to the Ancient One as well?

What happened?
gpt
Nope.

He gives them all to the Ancient One.  She's literally the best person in the Universe to return them all.

Already a Mistress of the Time Stone, has traveled throughout the multiverse, dealt with Gods, monsters and Eternals.

Moreover, how do you think Cap was able to create a young Steve/Peggy timeline without blowing a hole in the fabric of the Universe.