His division?
Conor is a solid LW. Not one of the biggest, but not one of the smallest either. Khabib didn't have a big advantage in strength, it was technique and carido mostly.
Conor is consistently around 170 lbs.
It looks awful at the weigh ins probably cause Conor is very lean. But make no mistake his bones are long and thick and he doesn't have as much mass as many other featherweights.
There's compelling evidence that Holloway, Lamas, Poirier, Stephens, and even Bektic and Maynard are heavier than Conor, to name just a few, with Aldo weighing in about the same, and Chad Mendes a few lbs lighter at his heaviest.
At Lightweight you have RDA who was around the 190s at one point, as well as 187 lb Nurmagomedov (significantly heavier than Conor), 190+ Tony Ferguson and Nate Diaz, heavy dudes like Gleison Tibau, 180+ lb Eddie Alvarez, Kevin Lee reports that he comes into
fight week at 176 lbs (his words).
Conor is undersized compared to the rest of the top LWs.
He is closer in weight to UFC top featherweights.