User blog comment:DuttPanda/The Freaking Fantastic Four Trailer./@comment-1755931-20150204131052/@comment-2058272-20150204213829

I'm just saying that their popular characters who have also been Avengers on many different variations of the team, so putting them in the movie would make sense. Also, how has Hulk been mostly a Defender? He's only been on one roster of the team, or at least as far as I know. I'm pretty sure he even left the team in one of the very first issues (much like he left the Avengers very early on)

If they wanted it to be exactly like the source material (which I know isn't what you're saying, you're just saying to do it justice or something along those lines) they would have Thor, Ant-Man, Wasp, Iron Man, and Hulk, then Hulk would leave at the end of the film, and maybe Cap would join in the sequel.