Board Thread:False Info and Speculative Discussion/@comment-128.163.7.156-20140915023057/@comment-5285305-20140916195626

Her knowledge of True Alphas is justified, considering she was an emissary of a werewolf pack. It's just a matter of how anyone knows WHO is a True Alpha. Can they sense it somehow? Deucalion and Jennifer both somehow knew. And Deaton only found out officially when Scott's eyes flashed red in the vault.

As for Peter, I'm sure he's known about True Alphas before. In the episode I mentioned, Stiles asked "What's a true alpha?" And Peter explained it fairly well. He seems to be knowledgeable of all things supernatural. Maybe it's all in that laptop he had in season 2 lol.