This is a youngster that already proved something. Because of that, he deserves to be coached by superior coaches and do the training next to superior players, even at the expense of less playing time.
His flaws will be terminated by better experts, not by playing more minutes in an inferior team and coaches who won't work on the problem. It is here where he'll become a better player, not Sassuolo, nor Genoa, Parma or Torino.
I'm happy to have this player in the squad. As mentioned, this is not just another youngster. He's the first teenager in +60 years that managed to score 16+ goals in a serie A season. Juve should be his home.