How Good is Khabib Nurmagomedov's Grappling?

Khabib's success in MMA is due in large part to his superior grappling, but is it really possible for one man to have an all encompassing skill set on the ground, or is there a chink in his armor that can be exploited by a submission savvy up and comer? I analyse Khabib's grappling in this video as it stands in the sport of MMA.