yeah, but probably wasn’t geared for a connection with the stones like it was in Endgame, (never specifically shown, but can only assume it was a contingency plan that Tony did develop into that suit) can’t assume it’s just a matter of just slapping the stones on there.
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He wore the mark 50 in infinity war and the mark 85 in the endgame. I don’t know for sure if there were 35 iterations between those two, or if that would even have made a difference in the suit’s ability to hold the stones, but either way, it would have required tony to sacrifice himself, which.