Barcelona is different. First off, They have players who are polyvalent. Indeed, Messi, Pedro and Villa can play down the center, on the right wing and on the left wing, Busquests can play in the midfield or in the defence, Alvès and Adriano too, etc... Plus, they aren't playing with their head. The majority of their playing is on the ground. They don't have a big tall boy as striker to receive the crosses. That ain't their playing style. And both their winger are cutting inside. So they ain't need conformist wingers. Finally, even if Messi, Villa or Pedro aren't wingers, they have winger's attributes. Indeed, they are fast, very skilfull, can dribble their defenders, and can put a good cross. If Kalou, Anelka and Malouda would have been like this, we wouldn't have need winger. But they ain't like this.