Ambiturner
Ssraeszha Raider
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i think strange being "critical" was that he brought everyone that was snapped back TO the battlefield. there's also stark looking at strange at the end and strange giving him the "only one" signal, which encouraged stark to do what needed to be done. though, i don't know if you'd call THAT critical.
Not sure what you guys are talking about with the "critical" thing, but Strange put everything in motion after viewing the 14 million possibilities.
Without Strange sacrificing himself, Tony was either killed or snapped and none of Endgame happens.