Ben Grimm as a homey follows naturally.
Ben's back-story has never really sat well with how he has been written over the years - I can understand that it was to contrast him with Reed but a Test Pilot and Astronaut who is that dumb*? doubtful.
* to be fair, a few writers have highlighted this now and again.
Ben Grimm is actually very intelligent. He plays at being dumb because of his background and because of his low self-esteem. His low self-esteem is what always prevented him from being able to change back and forth like the others can.