Mate, I think you might have called that wrong and I'm apparently not alone.
He may have done some daft things in his time and be difficult to follow when he speaks but I'm far from convinced that he does have a decent IQ and I am bloody sure he has a great football brain: that's one reason that he was such an exceptional player.
Whether has the necessary management skills is another matter: you can be very intelligent and a shite manager in all walks of life.
Mind you, we've never quite seen eye-to-eye on Yaya.