Well I don't really like his music but I will admit that he is really talented. I can criticize his tracks until I'm blue in the face but every time I hear a new remix he did I'm blown away at the production. Now if he has a ghost producer in the background or not is totally debatable. I mean, making those kinds of tracks is really, really difficult.
And someone that young that went from being in an emo band to producing electronic music (I will not call it dubstep because in all honesty it really isn't) and blowing up the way he did does raise lots of questions. But I guess anything is possible. Judging by the interviews I've read and seen on youtube he does seem like a very persistent guy, so who knows. It's almost as if he just kept going and going... trying different things until he found something that worked.