He fought multiple times a night. I don't think it was atypical for fighters to fight at a higher weight class on the regionals. They're not going against world class athletes.
It's like saying oh back in college, a guy who's a small forward in the nba use to play center in college and try to bring that as an argument to why they guy should play center in the nba It doesn't compute.( Not saying you're making that case but I see it from people who talk about the weight a a certain way)
What guy in khabibs regional circuit is big as Usman, big as Woodley?
Khabib says that but he had no interest of moving up period even against Woodley. Because of the mass difference. As quoted by the video I sourced and quotes. Before Usman it was Woodley and he still said no