That h2h lead isn't going last much longer, Novak will probably switch it by the end of this year. He also doesn't have a leading h2h against Murray. Nadal leads all his big 4 counterparts with h2h. He lead Federer during Fed's peak, he leads all his current age rivals as well. Del Potro, Berdych, Tsonga etc. It's not like Nadal's game is only effective against Roger it's effective against everyone. Davydenko leads the h2h 6-5, but one of those wins was a retirement. I'm not sure if there is anyone else close to leading Nadal in h2h that's played him at least 5 times.