SPOILER ALERT for those who haven't kept up...
So Aiden just let Stevie go? Untrained, undisciplined, and with no one to turn to? Knowing that the werewolf packs are hunting? Aiden should not be turning anyone! He means well, but he can be such a jerk.
Just to avoid confusion, I'm guessing you mean Kenny?
(I think Stevie was Sally's teen suicide ghost friend.)