Yeah, he's one of the best around at playing the final pass, and if he moves this summer I'd be pretty confident he'd get back to his old Arsenal form. Don't think he's capable of replacing Xavi though, he can't turn away from defenders the way Xavi could, he doesn't have the patience that Xavi has (which isn't necessarily a bad thing) and he isn't as intelligent in his movement - great at finding spaces but not so good at knowing when to hold back. You'll get a lot of people saying he wasn't given a chance in midfield but he's spent the majority of his time there, he only really plays as a false 9 when Messi is injured.