Bayern is an ideal example. Ribery and Muller are much better at tracking back than Hazard and Oscar. But yes, that is the model Chelsea should be going for. Relentless in attack but also regaining defensive shape quickly. Also, look at the Bayern midfield - Kroos/Schweinsteiger/Martinez are hard-workers unlike Modric. With the current midfielders we have, we do need protection in the pivot imo.