If Conor willingly gives Khabib a kick to catch, it's going to be a long night for him.
Conor gasses even when he's in 100% full control of the fight. Look at his fight vs Nate both times. He was visibly gassed by the 2nd/3rd. Same thing with Mayweather. Floyd let him dictate and control the beginning of the fight and Conor still gassed.
If Khabib gets on top and lands brutal GnP, it'll take Conor's energy even quicker.
Khabib will get a takedown and 1 full round of Conor being on his back will drain 90% of his cardio. Khabib can and will control where the fight takes place if he wants. Conor will not have any cardio for the 3rd round, I guarantee that.
Even if Khabib can manage to weather the storm for the first 2 rounds without any takedowns, Conor will gass himself out for the 3rd round. Easy takedown for Khabib at this point if Conor happens to still be there to answer a 3rd round. Conor will wilt and give up in the 3rd if he makes it that far.