I think it's between 3 people really, Tony, Lee, and Gillespie. I don't think Lee offers him much simply because he is prone to gasing, and a Khabib match will likely go the way of the Ferguson matchup; Lee starting strong then getting overwhelmed and caught with a sub or gnp when he's tired. That's what Khabib does usually, sap your energy, and don't think Lee will be able to keep up. So that leaves GG and Tony. Tony has by far the best cardio in the division, and maybe surpasses even MM for best condition in the promotion. Still, whether he does enough damage in the early rounds to have Khabib tired enough to stop him late is debatable since he is pretty easy to take down. Think Khabib would stifle him and edge it out with stalemate top positions more times than not. Overall GG seems like the perfect candidate to nullify Khabib's game completely and turn it into a sprawl and brawl type affair with Khabib having to fight a Tibau type fight where he needs to wall and stall him to have any success. If this fight happens, it's probably gonna be a dreadfully boring affair, but GG has better cardio than Khabib, is a more polished striker, and is the most decorated wrestler in the division. I think this would be a style make fights type deal, and even if GG wouldn't necessarily beat/dominate all the opponents Khabib has, he would be very likely to decision him. Only problem is, it seems that after 5 finishes and 3 POF in 5 fights, they keep feeding him nobodies and he is nowhere near a title shot. Seriously, what the hell was the point of fighting Rinaldi and Gonzalez after he beat Holbrook? GG needs someone in the top 15 and then top 10-5 ASAP.