1) If you are Enraged by Raptors you can only get rid of the beast status in the model activation. If an enemy activated some nice juicy target and you enrage it he has to wait till next turn to get rid of it.
If you activate Marcus after the Raptors than you can Alpha your target to fight for you. Next turn if you win initiative flip you can Alpha again and steal that target activation so he can't get rid of the beast status because he does not have an activation