Get real !!! Floyd only fight cherry picked opponents at home in vegas with his neighbors as commissioners and officials. its almost impossible for Floyd to get beat paquaio, margarito, Williams tszyu martinez ducked just for starters
Realisticly if he can get to 50-0 while winning a MW Title you could argure him. If his career finishes looking like this 6-Weight Champ 130-160, lineal at SFW, LW, WW, JMW, & MW, currently Undisputed at both Welter and Jr Middle so if he defends each off an on til a final MW bout technically he'd retire undisputed at 3 weighs WW, JMW, & MW concurrently If he retired like that, that GOAT type stuff.
I personally do not think it's possible at this stage for Floyd to come close to the status of GOAT. But if he beats Pacquiao and wins the legitimate middleweight crown at 160, he probably warrants consideration for top 15.