Rosberg is a very good and smart driver...BUT... to say he has better ability to react to the car than Lewis simply because he didn't slide as far back this race, is not a complete assessment.
Remember, Rosberg has been driving that car for quite a bit longer than Lewis. While changed a bit from last years car, the fundamental characteristics remain the same. Rosberg would have had much more time to somewhat find a few ways to manage tire deg...though not overall. Lewis is just now coming to grips with the car's characteristics.