It doesn't matter. People will look at that period and assume that Nadal's level dropped. Nadal STILL leads the H2H 19-14 despite that. Want to know what's lopsided? Being 2-8 in slams against someone. That's hardly a rivalry, it's utter domination.
Nadal's record against the other Big 4 (3), is truly the most underrated/under-appreciated stat of this era!
One day it will be given its due!