We all wanted him, and I still want him in Juve if he didn't wanna leave. His not perfect but he is still a top class young CB, very well rounded game.
It's rare for CBs to be as ready as he was from teen years (If we didnt pay that price Barca or Man City would have, and still had him). Will take time to mentally flesh out fully as top player (lack of focus at times) , but already one of the better top CBs.
Upamecano has no bussiness starting over him.