the thing i see with dybala is that he probably is pretty hit and miss in his action (shown even by his "best of" videos). he can afford to dribble past one player and then fuck up the pass, because he is the focal point of palermo and he gets most of the balls, but with us he will not get every ball played to him and if he fucks up half of balls we play to him by not being able to properly pass or shoot after dribbling he will get even less balls played to him and this will make his confidence decline.
