There are two problems with him - he can't play as an isolated #9, and his confidence is on the floor. He can barely control a ball properly or make a two yard pass, that is not down to ability. He'd be playing for Benidorm FC if that was the case.
I really don't know what the answer is, because Tevez has to play, and has to be allowed to play his roaming game. If Llorente can't improve his use of the ball then he becomes almost useless for us. We aren't going to use Morata-Llorente as a combination too often.