That he wasn't good with the U21s? No, that's no solution to your "riddle". He was part of a very talented looking team that really failed to perform under Casiraghi. That doesn't mean he couldn't be an effective club level player.
i did not say "he wasn't good with the u21", but did state that i saw ONE game that was so bad that you could totally write him off as anything but a water boy
no good player, no not even a mediocre player would play as bad as i have seen him play regardless of the team around him.
it's just like a guy touch a high voltage wire getting an electric shock and then touching the wire over and over again while getting shocks. that guy makes home simpson look like a MIT graduate
as defender you always have the opportunity to play it safe. if he looked good in some games (that i did not see) well, i can do blind passes the whole time and they will look great when they reach the teammate by luck, but thats about it.