I guess a vigilante, a vet, or even a Trapper theoretically could have done Caito in. Another town killing role may have done something, , if they had successfully absorbed / stopped a kill on N1, but I doubt there's more than one.
Do you think a Veteran would be the most likely of all of these? Does a Veteran on alert stop a cursed soul visitor?
A vigilante would have needed the first night to load a bullet, but since Caito flipped town, that vigilante would have lost their gun and became useless for the rest of the game. But if there was a vigilante, if a cursed soul came for them and they swapped roles, the vig power would reset. Claws is clearly hoping for this.
A Trapper could have set the trap on N1, then Caito stumbled upon it.