I think Penn could expel or take a diploma away from him. I do not believe it will. Too many kids who are admittable get in with various forms of inside help over other admittable kids who do not. If he were not otherwise admittable, like those Full House kids at USC, that would be a different story. But it appears that he got in in a manner that made sure he got in but he well could have been admitted especially had he applied early decision. It probably would open up a can of worms if they expelled him since he would sue, and expose all forms of line-crossing. This should cause some serious self-reflection on the part of Penn and all other schools in which similar things have happened, but I do not believe they will expel or take away his diploma.