Not sure why people are surprised. He hasn't suddenly changed as a player, this is more or less how he looked playing for Fiorentina as well.
This is the funny thing
He didn't change, he is playing like he allways has, just in a bigger team. But this drive, ferocious aggression combined with skill, decision making and decisive ability in final third, was being ignored by alot of people here. Because he is Italian and comes from Fiorentina, so naturally he must be a flop material, another Berna.
Scared themselves into a fervour, instead of just see and take the player for what he is. He simply has the right amount of ingredients as a player to make it in top top level, mentally but more importantly the direct and powerfully skilled style is tailor made for big clubs . If he wasn't signed by us or Viola refusing sales, I would seen him in Bayern or so already few years ago.