Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-5690373-20140210191450/@comment-220.255.2.209-20140308153821

I am pretty sure Allison is the nogitsune. Go back to episode 17 (Silverfinger) and you will notice that Mr Katashi gave Allison a very significant look when he advised Christ Argent to let the Oni destroy any nogitsune in their midst, "even if it your own daughter". And Allison would have access to Chris Argent's safe to plant evidence against him.

My theory is that the nogitsune is taking advantage of Stiles's vulnerability and manipulating him into believing that he is the nogitsune. It is an effective tactic to distract the others and divert attention away from the real nogitsune... something that is right up the alley of a trickster.