Possible scenarios are what they are, possibilities. But in the case of the historic “Fight for Charity” dare between two biggest names in boxing, there are only certainties. If and when Floyd Mayweather accepts the challenge to fight Manny Pacquiao for charity, the fight would surely be greater than great as it has been anticipated for years. But if and when Mayweather wouldn’t agree, at least he and his devotees along with the cynics would know that Manny is not desperate to tangle with Money in the ring for money reason; and that dud Mayweather would be proven a big joke once again.
However, should Mayweather opt to ignore the call and keep mum about Pacman’s dare, the people are not dumb and dump to take it as gallantry or anything positive to heal the sport or push boxing forward.
“Experts” are in unison declaring the pound-for-pound “number one” as the best. Cheers! Their consensus on the matter mirrors a lot of odd things in contemporary boxing. And it sends the people a serious message.
The issue is no longer between Pacquiao and Mayweather or between Top Rank and Golden Boy Promotions. It has come to a point that the “unbeaten” boxer has to contend with the entire boxing world excluding puppets. 
Toughness of mind and skill in facing toughest oppositions are equal to gallantry. It is the virtue most supreme and compatible to boxing as a combat sport. Thus beyond ring performances, gallantry should be topmost as criteria in choosing the Fighter (not “Fighter”) of the Year award. 
If you can’t be a part of the people, at least don’t be a party to the problem that the people are intending to solve. Where in the rule of reason or any sanctioning body in boxing we can find a provision which states that beating Adrien “The Problem” Broner can be translated into a credential to fight Floyd Mayweather Jr.? What if Robert Guerrero and Canelo Alvarez would whip Broner in an even more convincing fashion which is highly probable? Does that earn Guerrero and Alvarez the fresh mandate to battle Mayweather again? 
NO solid fight for the unbeaten “number one” boxer except the resurrected eight-division champion whom he got accustomed to avoid. Thus who is the Money Team looking for to challenge their “man” outside of the Filipino sports icon? Nobody. 
Aside from his brilliance to handpick toys, Floyd Mayweather Jr.’s ability to score points and beat his opponents lies in the “invincibility” of his defense. This is ax and stealth for him. And this is why he looks unstoppable in boxing.