3. Neither Hulk Nor Iron Man Are Likely To Appear In The First Act
At the beginning of the Avengers sequel, Whedon has to deal with the fallout of 2013s Iron Man 3, which saw Tony Stark's 'retirement' from superheroics to spend some quality time with love interest Pepper Potts. Add to that the fact that Banner's reclusive (for good reason), and that the Hulk works best when arriving at a moment of high tension. Bringing them - and their respective alter egos - out of their shells again could take at least the entire first act of the movie. Which, of course, means more Banner/Stark time. We anticipate that most of the early scenes featuring Stark and Banner will be two handers, Whedon taking advantage of the actors easy chemistry to bring the Science Bros together from the beginning.