Shuri & Tony - more mind bendy conjecture
Those were very good points, and Tony watched her as though this meeting of the minds was keeping him on his toes, and making him think of new things too. Wakanda was lucky to have Shuri. She was light years ahead of everyone.
"Exactly. Like a loop. Same people, different each time. But see? Here's the thing. I don't think Odin did know there was another stone here." Tony thought about that and snapped the fingers of his free hand as it occurred to him why. "The Reality stone. Asgard put that one on another planet. It infected Jane. So they were trying to separate them. Something about keeping them all in one place was dangerous. I mean, clearly, Strange's wizard buddies weren't advertising they had the Time stone, right? That means Asgard probably didn't know there was already one here."
Even so, "It still means that he could have put the Tesseract here for future use, to stop Thanos. I got a refresher course from Friday about it, and Odin was the All-knowing Allfather. So it's possible he might've knew. The guy's dead though and I think asking Thor about it is probably a bad idea. Sore spot, losing his family. You missed that storm he caused when Loki was caught."