His displays over the past couple of years have been very good and improving. Maybe with Alves, Poulsen and Keita leaving, he has upped his game and tried to become the leader which is a very good quality.
Any team could. Class will always shine through. he would just have to be satisfied with being rotated at Barca, something he will unlikely have to encounter at Sevilla.
For me, he is the best player outside the top 2, and I know I am not forgetting about Aguero, Villa or anyone else.
Ignoring his condition Bojan, I still think he wouldnt be nearly as effective on the left. Bringing him as a cover for messi would be perfect but unrealistic.