Luke is better at doing damage but his takedownsd aren't as good and he makes mistakes, allowing guys to get up.
Remember all those BJJ guys back in 2000-2005 that could kill everyone in 10 seconds on the ground but could never get anyone to the ground lmao?
Khabib can consistently get guys down. And when he gets them on the ground, he DOESNT MAKE MISTAKES.
The not making mistakes, ever, is what makes him so good. I've never seen anyone that can keep someone down like Khabib can. Guys about to posture his torso up.. Khabib gently nudges their chest and they fall back down effortlessly. Guys about to get try to stand against the cage... Khabib grabs their legs or leg triangles them. EVERY TIME.
Luke may be punching someone and doing heavy, heavy damage but guys will find openings and get back up and then they're back in the fight. No one gets up against Khabib.