I'll go first. All balls.
Fury
Wilder
Ortiz
Miller
Usyk
AJ
Ruiz JR
Parker
Povetkin
Whyte
Not bad, actually but I would drop Povetkin down.. He hasn't been the same since getting busted for steroids.
Much has to do with Chavez dominance at super featherweight and lightweight. De La Hoya faced Chavez late in Chavez's career if was earlier the outcome might have been different and also the winner.
Mayweather did pick and choose to remain undefeated but maybe we can blame it on the times. It has been the trend for a while and I can't say if he started it or not.
You have to feel sorry for Khan. He never had what I takes to be a top fighter. Losing every time he got near the big time. I guess that if you can't take a punch you should consider another profession.