I hate having to be that guy. I usually let those things pass. But something like "most skinniest" must be noted.
I would say Wilder. I was amazed how skinny when he was in Wlads camp. BUT... the boy can jump BIG TIME. We have a basketball court at camp to just play around after sparring or on day off and Wilder was slamming like a pro at a dunk contest!
Berto, Bradley and Marquez. Actually it's kind of common with boxers, which is why so much is made of Pacquiao's calves and legs in general.