Here’s a quick question for you, who is the most important actor in the Marvel Cinematic Universe? We all know who the highest-paid actor is — that would be Robert Downey Jr. — but is he still the most important actor in the franchise as well? Has Chris Evans or Chris Hemsworth surpassed him? How about one of the characters from Guardians of the Galaxy or a newcomer like Tom Holland? Is anyone in the MCU so irreplaceable that Marvel couldn’t introduce another version of their character? It’s a very interesting question, and one that the studio and actors are no-doubt struggling with internally.