We can say Rafa is comfortably ahead of Djokovic should he win this FO. He is not going to be above Pete or Borg. Those guys were ATG on multiple surfaces. Rafa is Andy Murray level outside of clay.
You have to balance versatility (i.e. "ATG on multiple surfaces") vs dominance on each surface (even for an "ATG")
Not all "ATGs" on a surface" are equal... And I think Nadal on clay is top of the tree on that
Not all surfaces are created equal either. As far as slams go, today hard is worth double clay and grass... there was a three year period in Borg's time when 2/4 (and more importantly 2/3 of the ones he entered) were played on clay. Laver had 3/4 on grass
You'd also have to look for lack of weaknesses as a factor. Sampras, obviously has the glaring one on clay for example. By contrast, Borg's pretty solid even on his personal weakest area (hard courts). Nadal has a debatable oddity indoors
Layers upon layers - nothings simple in ATG talk - probably more so than usual where Nadal and his clay heavy resume is concerned
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