Islam is probably better than Khabib. Better striking, more diverse grappling and takedown arsenal. Khabib just mauled guys who can't fight wrestlers like RDA, Conor and Poirier...literally all of them are super weak to wrestlers. Beyond that Gaethje gets sluggish and gassed when fighting hard by the 2nd round consistently ffs 6-4 UFC about to he 6-5.
Meanwhile Islam has beaten Volk, Arman, Oliveira, Barnaoui...arguably with his first defense already had a better resume vs harder stylistic fighters and has shown a far more complete and technical game. Khabib is mostly a myth, I'm over it. Dude lost to Tibau, none of these Caucasians are unbeatable, clowns sensationalized because they don't understand.
Caucasian fighters are amazing many more champions to come but also many more losses to come for them too, don't worry. The sport has to catch up to the dominant grappling Meta the UFC has artificially tried to remove so people are less prepared now.