I'll take VD's lead for argument sake and present a list that imo causes problems for Floyd based on what I have seen. I'll keep it to the original 8 to narrow it down as 130 and 140 would only increase it.
I defend the man as much as anyone and I don't really like him but this myopic claim that he is the Goat is just to much. Roy Jones is the greatest fighter that I have ever seen not Floyd Mayweather.

126
Sanchez
Arguello
Olivares
Gomez
Hamed
Mab
Lopez
Nelson
Pedrosa

135
Buchanon
Ramos
Duran
De Jesus
Shane
Whitaker
Comacho


147
Napoles
Benitez
Palomino
Hearns
Leonard
Wright
Breland
Duran
Quartey
Forrest
Shane
Whitaker
Curry
Haugen
Taylor
Vargas. The one that beat Ike and Winky.