... they not integral parts of the Avengers as well? Wait could it be that Marvel, knows which of it's characters, that they still own the rights to that is, are the most popular. Hmmmm Hulk, thor, Iran Man and Capt America. Black Widow and Hawkeye have a various times had significant roles in the Avengers, but as a general rule they've always been second fiddles to the big four. What about Vision, Scarlet Witch, Quicksilver (who I heard a rumor is not dead, you never actually see a gravestone, he is just not there at the end of the movie, recuperating?; he will be back in Infinity War) War Machine and Falcon?