Question: Did it actually have to be Tony that had to snap Thanos and his army? What difference would it have made if somebody like Clint or even Peter Quill snapped them? As long as Thanos and his army were destroyed the world was safe.
JokerInTheBronx
7th Nov 2019
Answer: Yes. It HAD to be Tony. Strange said there was only ONE timeline where they succeeded. Also, Tony's armor provided some level of protection, letting him live long enough to snap. Most others, besides Hulk, would've died just by putting the gauntlet on. But, Strange foresaw this. He SAW this one reality where our heroes win. He SAW Tony die. It's also why he pointed and nodded at Tony. There were probably other timelines where someone else got the gauntlet but couldn't survive long enough to perform a snap. Clint would've died without armor, and Peter no longer had his Celestial powers after Ego died, so Peter would've died too.
JokerInTheBronx