He needs some polishing but Max will use him. His runs, finishing and heading capabilities are very good. Tactically and passing need to improve, with the tactical part being one of Max’ best coaching abilities. I’d be surprised if Allegri won’t use him a lot, finally a midfielder with decent box to box characteristics in his squad.
Lets not forget that McKennie was utilized as a RM and occasionally as a LM by Pirlo. Not strange that he looked so lost on the pitch, same could he said for other guys like Kulu and Bentancur.