I mean you look at high level sub grapplers generally and they don't tend to lose by submission much in MMA do they? typically only in there declining years as the chances of a "lucky sub" is far less than than a "lucky strike", maybe you could argue a guillotine can be a threat to anyone I spose but really it just doesnt happen much.
Added to that as well the test of someones skill in MMA isnt only about fighting opponents with the same skill, rather its about could they turn their skill to there advantage?
If you wanted to say Nog didnt have the BJJ vs BJJ skill level of Werdum then maybe you'd be correct although he was good enough to neutralise him in his prime and win via striking. What I would say though is I think Nog might have been better than Werdum in terms of exploiting his BJJ advantage, he was very good at hitting submissions during scambles which is I'd say more of a MMA specific skill set, alot of fighters like Crocop, Sylvia and Semmy got caught that way.
I mean another obvious example of this is Frank Mir, even moreso than Nog his sucess depends on going for aggressive subs in scambles rather than BJJ chess matches and he has a much worse record than Nog of getting beat up when not given openings in his prime vs guys like Freeman and Lesnar.
Nog to me was more a mix of strong technical BJJ and Mir, Palhares, Aoki, etc style aggressive submission fighting.
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