Seems to never be talked about -- the friend, Schuman (I believe)

So a character that seems to never, ever be brought up--and admittedly, he is only on the screen briefly and is underdeveloped (at least in the film)--is the friend/sometime dealer character, Schuman. He's there the first time candy shoots up, a few other times, the wedding, later once he's shaved his head he sells them some dope. I thought he was an interesting character, but the main thing to talk about is the odd but interesting scenes with him at the wedding reception--his fixation on the little girl, seeming to relate to her above everyone else. Was this merely to suggest he was child-like, or actual attraction??