People don't remember that Khabib already had 3-4mil insta followers before the McGregor bout.
Cowboy Cerrone, already a popular fighter by his own right, after fighting McGregor, currently stands at 2,2mil followers. Dustin, after beating Conor, is now at 2.7mil followers.
Today: Conor 39m (was about 27-29m when fought Khabib)
Khabib: 27m (was 3-4m when fought Conor)
Nate Diaz: 4.6m followers
random number for comparison: Zubaira Tukhugov - 3.2m instagram followers, still more than Dustin or Cerrone
I think it's simply inevitable that Khabib would have gotten to super stardom, simply because of being muslim and russian sports frontrunner. Will be likely doing numbers like Salah in future.