thats why he is used as a regista now. if you put asamoah in the btb role you will just get another one of these. marchisio at his best mastered that role, now he has a downfall (lack of cofidence, different role), but from him we atleast know that he can (or could) play that, and if he can his form back he will be able to play that again, with asamoah on the other hand we know that he can never have such a role.