I've grown to understand these "Khabib is a weight bully/he too scared to move up to WW" advocates.
That's what happens when you're so utterly dominant in your weight class most naysayers, short of admitting your prowess, awkwardly grasp for straws to temper or lessen how good you are.
One of said "straws" is pointing at something you have never done but never really had the need to (moving up a weight class), knowing you'll never be able to do it any longer (in this case, since you're retired).
If there's a clinical diagnosis for "coping", this has got to be one of the bigger tells.
Intellectually dishonest, self - serving, but all in all, a colossal, if unwitting, admission of another's undeniable greatness.