We need to take size into consideration when determining who is the GOAT.
Remember that being 5.3 140 is as disadvantageous when it comes to fighting than being 6'8 300 pounds when it comes to running marathon, and that the fact midgets can still win titles in fighting while giants can't in running is because of the very dangerous nature of fighting : if a 5.3 130 pound guy shows up against a 6'5 260 pound guy, he might die, and the promotion will have very bad problems. If the giant shows up at a marathon, he just loses, and goes back home healthy.
There are thousands of boxers who could beat Floyd, including amateurs.
They are HS kids that could outwrestle DJ.
Only sport where you still have a little chance as a midget would be BJJ, and even then it's always almost LHW or HWs who win titles in Absolute.