Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-99.150.170.209-20130926213941/@comment-6207588-20130926225829

While I do believe that Peter would be more than willing to kill his betas I actually think he would turn down Deucalion. His ego is too big to play second fiddle to someone else (at least when he's in alpha mode...I know he does it as a beta but he really has little choice then...and even then he's still plotting behind the scenes).

I suppose there is the power thing...if he joined Deucalion and eventually killed him, he'd have control of the alpha pack (and that would mean more power) but like when Derek was talking about rescuing Boyd and Erica, Peter said it wasn't worth the risk. He's always going to weigh his personal risk against the gain he might make powerwise so I think he might view taking on Deucalion as too much of a risk (perhaps one of the reasons we see him go after Jennifer in the final and not Deucalion)... just speculation of course.