Right, I understood that. But Soul-Banner told the Ancient One that by returning the Stones to their proper place and time they would close off all alternate branches, and in this case they failed to do that. The Tesseract that Cap has at the end of the movie is the one from 1970, so he returns it to Camp Lehigh right after Stark has taken it, meaning it's still available in 2012 for Loki to make off with it, and so it doesn't get taken back to Asgard for Thor 2.
That remains in that alternate universe. Only Thanos' ship made the crossing so that was just a fan service showing Loki surviving. Loki would need Pym particles and the time line GPS to travel successfully to the Prime timeline.
So, Tony didn't try to lift the Hammer...but he did manage to pry all of the Stones, including the Power Stone, off of Thanos' gloved hand without being vaporized...is that how he shows he's worthy? Or does the Power Stone only do that if it actually touches flesh, and Tony's hand was still protected by his suit? And then Cap has to handle it afterwards...
From what I understand, the Iron Man armour is able to absorb an immense amount of energy, Tony probably built it with the Infinity Stones in mind. He was the most forward looking of the group, that's what got him into trouble so often, he could see not the way the world
was going, but the way the world
could go, and posture himself to help it along. Regarding the stones, the sorcerers may have put a magic shield around each one, just enough to stop anyone from actually touching it and vaporising themselves.
I've seen a lot of queries regarding the new shape of the stones, it seems pretty straight forward to me, no one knew where most of the stones were, remember it wasn't until Age of Ultron that the MCU characters realised that Loki had been handling the Mind Stone all along, the Space Stone could be just put back in the cage, let SHIELD see it was a stone not a cube, everything else would be identical. The Time Stone gets returned to the Ancient One, and the Power Stone put back in the column, only difference there is that Thanos' hunters can't come and find Quill, so he gets away scott free.
Because that's how Doctor Strange brought everyone, snapped or not, forward to the battle. Falcon gives Cap a ten-second 'incoming' warning as part of it. Look at everyone there, not all of them were dusted.
It wasn't just Dr Strange, it was all the sorcerers, they came from all over the world bringing all of the fighters with them, that's why there were so many magic shields going up when Thanos started his bombardment. Rescue would have come through Wong's portal, with all the other New York based fighters. I have to admit, the arrival of the forces of Earth brought a big smile to my face, everybody came to the fight, after Thanos' monologue about how much he was going to enjoy it, I got the feeling that he really didn't enjoy that battle one bit.
Speaking of Thanos, I reiterate what I said after Infinity War, what a moron! Wipe out half the life in the universe? Excellent, you've bought about a century on Earth until population reaches the same or higher numbers! Given that he destroyed the stones afterwards, what was he going to do about a resurgent universe? I've long thought that he decided what he wanted to do first, then rationalised it as best he could, convincing himself and others along the way that it was really for "balance".