Bre
Breh, like what are you talking about? Is this you're attempt to turn the conversation into some esoteric and nebulous shyt? I know you don't know much about boxing, but you really need to get up on the history of the sport before you attempt to clarify things for others. Arguello is the best junior lightweight of all time. Duran is the best lightweight of all time, fact. Chavez the best junior welter. Ray Robinson the best Welter, fact. And 154 is debatable, but it isn't Mayweather for damn sure.
What you're asking is like saying what makes Ted Williams, Tony Gwynn, Ruth, Ty Cobb, Bonds, et al the best hitters of all time. It's generally agreed upon by people who seriously follow the sport presently and retroactively. Mayweather can't be the best of all time if he's not even the singular man in a division. This is common sense. It's like saying that Ali is the GOAT, but Joe Louis is the greatest heavyweight of all time.
By the way, Sugar Ray Robinson is clearly the GOAT fighter. Floyd would cryogenically freeze himself to be revived at another time in history on some Demolition Man shyt if he had to fight Sugar. I don't even know why I'm entertaining you. You don't even know who the 140 champ is without googling it, but are in here trying to talk boxing.
I'm going to let you rock, though.