There is no haste - the post was very deliberate. All of the stats I posted were meaningless and arbitrary because on (or more) slams were not considered in each group which is a rediculous way to look at slam titles. The ATP don't see the need to issue different ranking points to slam which means a slam is a slam - especially when 'without clay' is the only one ever brought up. I could understand (slightly) if Rafa had won 17 RG but the guy has won all four slams, the only one of the three to win twice on all three surfaces and has made the final at the AO five times, Wimby five times and the USO four times. He has nothing left to prove ''off clay''.
What you are saying makes perfect sense. Indeed Rafa is one of the few greatest tennis players in history. If you removed clay entirely his career of 6 major titles, and 14 finals would be top 10 open era. He has feck all left to prove.
However in saying these sensible things you are repudiating a straw man argument. (Namely, that he's a clay specialist, a one trick pony, one dimensional, and other such garbage.)
The point being made here is that his achievements are more skewed to one surface compared to two other tier 1 guys whose achievements compare to his own.
This is backed up by simple objective facts.
eg1. 11/17 is more skewed than 7/15 or 8/20.
eg2 Nadal is the only one of the three to have a losing record in finals away from best surface.
finals record on best surface / other surfaces
Nadal 63-10 / 25-31
Djokovic 54-19 / 23-14
Federer 69-25 / 30-22
These points in no way reduce Nadal's greatness or standing as a living fecking legend of the sport. But once the conversation turns to the impossibly high standard of being the greatest player of the last 30 years, and the guys being compared to him are freaking Federer and Djokovic, then yes, I think it hurts his case a tad that he is so clay heavy.