Avengers: Infinity War - 9 Ways It Sets Up Ant-Man And The Wasp, Captain Marvel & Avengers 4
5. Doctor Strange Knew How To Win, And Tony Stark Can Carry It Out
Doctor Strange saw 14,000,605 potential outcomes of the fight against Thanos, with the Avengers winning just one of them. However, his line to Tony Stark about being in the "endgame" and his sudden willingness to sacrifice the Time Stone to save Stark means that we're now on the path to that solitary victory.
Quite what needs to happen is unclear, but it makes Tony absolutely crucial to Avengers 4. He's the one who at least knows Strange saw they can win, and can go about piecing together exactly what it is he saw and charting the path to victory. Strange has set it up, and now Stark can carry it out, once he gets back to Earth that is.
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