I watched a large number of his games for Milan last season and his main/key attributes is, his directness/crazy pace. He is always trying to take on his man whilst being very unselfish more often than not. There isn't anything that I would pinpoint and say is exceptional right now but overall, he has a lot to his game that if he continues to improve, could see him become one of the elite. Also, I'd rather not mention the fact he was voted Serie A's POTY after the performance of the previous year's winner.
I'm still of the thinking that, unless a player, especially a younger player, has a record-breaking season, you shouldn't get crazy until you see how they fair in the following season (Nkunku is one that comes to mind). However, it's generally too late to go for such players by then, as we can't go toe to toe with the biggest clubs for a host of reasons, so we either strike while the iron is hot & take a calculated risk or kiss goodbye to the prospect of developing a talent into someone WC.
First I've heard of that link. I've only seen glimpses of him, so I couldn't pass judgement either way.