I understand everything about you. Execute the Shaman. The Cop is 100% not the Mafia. The Mafia used his own ultimate ability; the activation of the Orc's ultimate would look different (as I think). And I'm not saying that the Cop can't be the Mafia. But if he is the Mafia, then the chances of the Orc being the main host of Kenkael seem doubtful to me.