He isn't on steriods. He had to cut weight to make 265 in the UFC and they use USADA. He's just a huge dude. Ngannou has been tested for roids, for years, far more strenuously than anyone in boxing ever has and passed every test. Boxing is an incredibly dirty sport so I suppose I get where you're coming from but if you knew anything about who you are talking about you'd know he doesn't need drugs. If anything, roids would inhibit his boxing performance because he'd be so dense he'd gas out. Obviously, gassing out at his size isn't a big problem for him.Fury's timing wasn't there, as he stated after the fight. You could see it for yourself during the contest. Ngannou also looked completely roided out. If he could show as well again in a rematch, off of the steroids, then it would be more valid to say he is a bad man.
I've seen roided out muscle men lighter than Ngannou box before and they gas out fast.