Quote:
Originally Posted by Valiant
They didn't dust him in the past. They dusted him once on the planet. Then past thanos came through the time machine setting up the reality that is current for the heroes and died there. In their reality he defeated them already. It won't change anything as they didn't alter their past.
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He came from their past though. He came from their 2014 (I think that was the year) and then they dusted him in the present. Anything he would have done between 2014 and their present would have been eliminated. Hell, he would have never been around to dust half of everyone to begin with. After 2014, Thanos would no longer exist. To truly get it right, Tony should have sent everyone back to their time with no memory of what transpired. They still needed Thanos to do bad things or everything would be changed.