Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-69.121.172.69-20130820040029/@comment-5724816-20140508071130

Jeff said every alpha has a second form ( beastly / demonly ) form they change into when they have mastery over their powers.

Alphas like Deucalion, aiden/ethan( merged form ), talia, laura and peter used this power. Also ethan/aiden could not use their merged form when they become omegas so merged form is a alpha exclusive form.

Scott didn't use this power because he probably didn't know about it.

Derek because he haven't mastered his alpha powers before he lost them like alpha roar and memory trnsference.

Kali because she relies most on fighting style instead of speed and brute force so she didn;t need the other form.