When people talk about the successful high-wire act of the Marvel Cinematic Universe and the unprecedented forging of a path towards the team-up film Marvel’s The Avengers, they sometimes forget one major stumble on that road: Iron Man 2. The sequel was greenlit quickly after the first Iron Man proved to be a massive success, and after fans went nuts for that Nick Fury cameo in the post-credits stinger. So Marvel Studios’ plan for the sequel was to lay even more track for the idea of an extended universe, but a rushed production schedule, creative disagreements, …