He looked like a beanpole at 212 so he probably would have struggled to get down to the 200 limit. Shavers is a much more probable candidate since he was a little fleshy even at 210.
Shavers hit a lot harder than both IMO. One of the hardest CW punchers (by modern standards) I've seen.
While it’s been mentioned I definitely think Wilder could’ve made cruiserweight, I know he was a bean pole at 212 but he’s still fully hydrated at that weight and I doubt he was eating himself down, it was when he ate himself UP in the fury rematches where he looked worse. A cruiserweight Wilder would’ve taken people’s heads off, sheesh. Apart from the schooling Usyk would’ve given him he would’ve been a problem, definitely the hardest sub 215 puncher ever