“It’s hard to call Khabib the greatest since he didn’t fight every fighter. He won the promotion's title against Al Iaquinta. You know, Iaquinta was not even in the ratings at that time. Then Khabib fought a couple of decent opponents and retired from the sport, so it's hard to say that he is the greatest. He is definitely one of the best. For me, "The One" is B.J. Penn. If he had not resumed his career and had not lost a few fights, then we would all now be talking about him as the greatest fighter of all time.
Recall that Khabib ended his fighting career in October 2020 with a record of 29-0.