If you actually listen to Khabib's interview afterward, he said (of giving your neck for a guillotine), "Very few people know how to do this."
People simply don't realize Khabib is a Master Grappler. He calmly makes subtle moves and adjustments, removing the pressure from his neck, calmly extracting it, and then proceeds to go about beating your ass, because of the top position he achieved while you foolishly thought you had something.
The crowd may have got excited about Dustin's guillotine; however, the truth is Khabib gave it to him to achieve top position. The amount of world-class grappling experience Khabib has is simply unmatched by other MMA fighters.