Well, Dyala's magic isn't too useful if it stays on the bench. If Allegri had been coach when Pogba just arrived, Pogba would have never played. He prefers to play fucking 12 goal career high Zaza instead, still so bitter about that.
The reason why allegri sticks Zaza in there is that we are lacking in finishing. I get it that we are not clinical and the thought that an out and out striker will help remedy that...except that Zaza has never been prolific and sucks at everything else.