Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-69.125.32.234-20140201200739/@comment-19765459-20140203194718

Derek keeps Peter around because he is useful. Derek obviously didn't devote a lot of his youth to his werewolf lessons and there are a lot of things about their powers that he simply doesn't know. But Peter does. So he needs Peter. He has nobody else to ask those kinds of questions, since Deaton is even less inclined to be forthcoming with Derek than he is with Scott.