Here’s my new theory. We see two stones go into that gauntlet and one in the Eye and Logo Marvel Avengers Infinity War shirt. These are gems. But the Aether was not a gem and can’t really be something like the Tesserect with one inside of it. So here is my big guess on where the soul stone is. It is not the same size as the other gems and something in the past happened to it

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I think in order to get that stone into the Logo Marvel Avengers Infinity War shirt and some power sapped away is to find out that is the case at the end of the movie and see Thanos stepping into a portal to Earth before that Vibranium fell to get it in his gauntlet and Strange will open a portal with whoever is alive and standing will follow him through while Earth starts disappearing around them after the portals close. Mid Credit scene we see Ms Marvel in a ship coming to help but the Earth is no longer there.

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And she remembered everything… Now if things get set back to “normal” that means that the Mutants would exist in the Logo Marvel Avengers Infinity War shirt.. They could also reveal the Inhumans / Beta Ray bill / Silver Surfer! It could also explain where the fantastic 4 have been!! Assuming the building in New York is Ozz Corp… Which could Tie into any other story.