There are different ways of looking at it. One is that at one time people were talking about him as the new Maldini, he is young, Italian, and can play on both sides of the back four or midfield five. In reality he's not the new Maldini, in fact he hit a wall with two injury-plagued seasons and then this farce. But it's one thing playing for this shit Milan with a different coach every few weeks and another for a ready made behemoth like this Juve.
The main thing I like about this potential move is that it seems Allegri has personally requested him, and he is the one who brought him through at Milan and got his best early form. Potentially for €9m-€11m it could be a shameless robbery. Or it could be €9m down the drain if he's constantly injured. He hasn't really been this season, as far as I know.
What a total mess Milan are.