I may eat my words in the second half, but Costa has once again been non-existent. I've seen him 7 or 8 times now on TV, and he hasn't stood out at all. One season wonder? There is the saying that form is temporary, but class is permanent.
A bit like Pelle, maybe just found the right manager in the right situation eventually. There can be no shortage of potentially excellent footballers failing to live up to their potential.