I think the big problem is how disciplined he wants everyone to be, it's no surprise they're struggling to create when your manager cares more about pretty much every other aspect of the game than being spontaneous or taking a risk.
I'm not so sure Guardiola would provide the freedom that some of them would relish to be honest. Could see the likes of Hazard struggling still, he likes to be centre of the show allowed to do what he wants, an attitude that I think will stop him ever being up with the very best.
Think they need someone who will pander to their egos to an extent, let them have a bit their way some times. Sure they all bought into the Mourinho mantra at first, they had a title to reclaim and he was the man to do it. I think they're all sick of his controlling ways by now though, there are some big characters there who aren't going to like be told exactly what to do all the time.