Hazard and Oscar can easily become as hard working as Ribery & Muller, they just need a manager to instill that hard working spirit into them. And Modric is hardworking - he's just reluctant to put in the tackle as you mentioned before but that doesn't mean he doesn't work hard for his team. We need protection in the pivot yes, but not to an extent where we need two defensive minded players. If you pair someone like Mikel with Modric then you have a nicely balanced pivot.