Re: Do you think this movie is going to be too big?
Call me cynical but I've yet to hear any director say, yep we're totally throwing in characters to occupy the screen and they're not really going to play much role at all. I don't think anyone deliberately sets out to do an overcrowded film full of sketchy characters.
I have trouble believing that the movie with the cast this big is going to explore the relationships of every single character. Plus "function" can mean whatever - it does not at all guarantee that a character won't be a throwaway.