Organization of the defence is important, but still there were clear indiviual errors by bonucci. 3 times last night that Ranocchia managed to hit the ball on target from set-pieces and it was clear that Bonucci had to mark him yet he failed miserably.
Problem is, last night's game wasn't the only game were Bonucci looked extremely Amateur. Almost all of last season he made errors just like last night (with the exception of a very few games) that is simply unacceptable from a professional defender playing for a club like Juve.
Last night the whole team played well IMO, but a defender like him can easily destroy all that hard work with such performance. We're gonna really regret it if we keep faith in him this season and lose many points because of that.