Said it a few pages back. He's undeniably in good form, but he was shite (as was everyone else at the time) under Rafa's tactics and I suspect his form would dip as soon as he came back if we didn't start playing much further up the pitch.
I would love us to keep him and play to his strengths, and if we had a revolving door of managers I definitely would, but I don't really think it will work out that way and I love Rafa loads more.