thing is that he's not second best to Zola , he has a long way to go to be considered as one of the greats in Chelsea history, alot to prove and alot to win. The question is could he take his place in the galary of Chelsea greats? For me the answer is yes, if he stays here long enough its possible . Could he surpass Zola? very hard task but i believe he's gifted enough to get there, alot depends how he evolve as player in the coming years but the potential is there.