Yeah Pacquiao and Mayweather are ranked much about such, if one beats the other it'll enhance his standing enormously. Hard to imagine another fight, almost in history, that would have enhanced a fighter's p4p ranking more completely.
I would respectfully disagree. If Pac beats PBF his ranking would gain the most. I don't think PBF beating Pac would make his ranking go that much higher. For example if PBF retires undefeated 50-0 without facing Pac he would be a top 15-20 ATG if he beats Pac not really any higher maybe top 15 ATG if that. However ,if Pac beats PBF his ranking would go much higher top 30 maybe top 25. Pac has more to gain from fighting and beating PBF than PBF does from fighting and beating Pac.
If Mayweather retires without fighting Pac, he's not even top 100 ATG. That's the ultimate ***** move. Not only that, but he's going to derided his entire life. Even as an old man, people are gonna call him a *****. All because he was ascared to fight some guy he talked all that **** about.
On the other hand, if Mayweather fights Pac and gets his ass beat, which he will, then he will be ranked in the top 50 at least for showing some ***** even if it took 6 years.