The ability and muscles were always there, he lacked in positioning and tactical awaraness. Looks like Allegri team worked on him and were able to teach him some of this really fast, because he looks like a completely different player now, when it comes on the positioning aspect.
In the first half of the season he ruined ur defensive line so many times, looks like he can keep it now. Serie A was probably a shock for him at first, which is understandable, but tbf i lost hope there will be any decent player from him. Its really good that it seems i was wrong yet again on a player.