#2 Mind, body, spirit
Alright, this may seem a bit cheesy--however, the fight game and martial arts world has always propagated the belief that fighting isn't just about the physical aspect of one's life, but also the mental and spiritual spheres. Mind, body and spirit must work in conjunction so as to ensure that the martial artist enables himself to perform to the very best of his abilities.
Upon close examination of Conor McGregor's balance between the three aforementioned elements, it's fairly obvious that he's quite the gifted man in every department of the game. Granted that his past cardio issues may adversely affect his physical sphere to a certain extent, however, The Notorious One seems to have worked tremendously hard on the same and proven against Nate Diaz that he can indeed go 5 rounds if need be.
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Besides, McGregor's mental fortitude is unquestionable, whereas his fighting spirit remains one of the greatest this sport has ever witnessed. On the other hand, Khabib Nurmagomedov is similarly gifted in both the mental and spiritual realms--perhaps possessing a slight advantage over McGregor in the physical sphere due to seemingly superior cardio.