Because he's been better than the other options at LB for both Juve and Ghana. Both coaches feel they have more midfield options than at fullback. So when Kwadwo is back there, we're obviously a much better team than say if De Ceglie is back there, or Padoin, or Molinaro, or Grosso, or Toure, or Caceres playing his off position, or Grygera playing his off position, or... Pepe... I'm pretty sure I remember Simone playing a touch of LB... fuck, what a reign of terror that LB position was for us post-calciopoli -- until Asamoah came along.
The man is a very good defender. I am all about Asa, and I know he's a tremendous midfielder --a better CM than LB -- but the situation is what it is. We have world class written all over our midfield, and few options at LB. Evra was great down the stretch, but we'll see how long he can keep that up for.
It's all about team. Kwadwo does a great job, even if it isn't his preference. He needs to be playing, he's got too much quality for the bench. Service to the team is his priority, as is winning silverware. Also, it will be interesting to see if Allegri might actually move him around a little bit, considering he's finally totally healthy.