Boxing has been doing this since the 80’s. Floyd may weather would get fucked up by an average 6’3 240 lb dude. Heavyweights are and should be treated as the pinnacle of combat sports.
Khabib was a weight bully his entire career. He depended on being bigger and stronger than everyone else at 155. Once the cut became too much he retired.
Khabib didn’t just build a legacy he’s building a dynasty.
This is why he’s the biggest name in the sport and will grow with each new champ he coaches and Nurmagomedov MMA will rule the sport for the next decade or longer while GSP is a relic from the past and comparatively irrelevant.