The bottom line is that in Singer's original movie universe, Scott, Storm and Jean were among Xavier's first students. Somehow that got lost in translation for First Class
. In my opinion, deleting all of these B and C-list characters is actually a good thing. None of them--Dawin, Havok, Angel, Tornado Boyeeee, Azazael, etc--were interesting.
Emma was dry as hell too.
The best of the rest is coming back and I think if they enhance their presence with the addition of young Storm, Jean and Scott, it will actually raise the stakes for the future events, perhaps even preventing Scott and Jean's death and thereby "fixin s***" as Bryan has been promising to do.
I, for one, am very, very happy with these deletions.