I'd just like to remind everyone that Khabib has never actually fought a legit top 5 LW fighter, while said fighter was deservedly ranked in the top 5.
He fought RDA before RDA was a top 5 guy. And Edson Barboza never should have been ranked top 5 -- Edson only got that top 5 rank because Conor, RDA, Cerrone, and Nate Diaz all left the LW division. Of course you are going to move up if 4* guys above you leave the division. The second Edson fought true top 5 fighters (Khabib, Kevin Lee), he got exposed.
I'm not denying that Khabib is a great fighter. He is without a doubt UFC championship level. However, people are acting like he could go 6-0 over the next few years fighting Conor, Tony, Poirier, Alvarez, Kevin Lee, etc. This is where I take issue with the Khabib fanboys -- the guy is totally unproven against true top 5 talent. Let's see how he handles other championship level guys, before we declare him the GOAT.