Your just assuming things and generalizing. He has fans and followers from different places. There is not even that many in the Caucasus you may think it's less then Ireland which means around 3mil and that is when you add Chechnya with Dagestan.
The way his career is gonna play out can't be compared to Khabib's nor does there fanbase overlap as much as people think there are many Khabib fans who are anti-Chimaev on sherdog. who felt threatened by Khamzat's presence.
It is wrong to think Khamzat's fame will play out like Khabib he could even explode 4 times bigger then Khabib and become a phenomenon like Mike Tyson or just become normal famous like Jones or GSP without reaching Khabib or Conor level or he could explode into the atmosphere and reach Mike Tyson level of fame. It can happen both ways and hard to predict these kind of things as it always happens natural