Board Thread:False Info and Speculative Discussion/@comment-120.148.21.3-20140729094424/@comment-124.187.46.96-20140730182647

Well, we don't know that Derek is unaware. After all, Scott and Stiles weren't in on it last season. In fact, Lydia, Allison and Peter were the only one's aware, with Scott suspicious of something, yet both Scott and Stiles magically knew when this season started. It's assumed that Lydia told some people, and it's possible that Derek was one of them. Even if she didn't, would Scott really hide that from Derek, when he had no reason to do so?