That's what I don't get. But if you look at the team on the field, Morata is actually playing fully on the left as a LWF. He's capable of that, he showed it at Madrid, but it clearly isn't suiting him today, as he's out of form. Dybala isn't really capable of playing LWF, if he's a winger, he's on the right where he can cut in and shoot. He played RWF at times for Palermo and Instituto. I think the formation is a bit of a mess, or at least how Allegri has set it up. Morata is playing far too wide and back toward mid for a player of his qualities. As a LWF he should be playing with a more free role, and towards the centre.
With this team, I'd like to see a 4-4-2 right now.
Licht-Bonucci-Chiello-Sandro
Cuadrado-Hernanes-Pogba-Pereyra
-----------Dybala-Morata
This team would be absolutely deadly on the counter.