It's one of the directions I see Children's Crusade going. Billy and Tommy discover that they aren't really Wanda Maximoff's sons; Billy's powers were granted to him by Scarlet Witch's reality warping when she ran into him outside the Avengers mansion; and Tommy was created by Billy's reality warping to make his belief that he is Scarlet Witch's son (a.k.a. The Ultimate Fanboy Delusion) sound more plausible.