Just think of the terror he's inspired in Alabama amongst itinerant road sweepers, nightclub bouncers or random people stopped in the street and offered a bout with the bronze bomber.
If the o.p. considers Alabama to be the whole world (which he probably does) then Hybrid possibly is on top of it. replacing cletus the legendary banjo player. In terms of the real world Wilder, on the back of a life and death victory over a 45+ year old heart patient, is basically stalking Joshua and Fury to try to get a cash out - hardly someone on top of the world.