He will not do it, i don't remember any rematches that he agree to play with, and Mayweather will not let his guard down, he will not let other people win the game because they might do like what he did to them, if he will make a rematch with Manny expect that it will create a tons of money again, but the thing is he will not be the winner this time and I am sure of it, and if ever I will not bet in this game, I rather bet in not so well known boxer rather than a game with Floyd.
Mayweather will really hold into that record until he dies. I think it would be a miracle if Mayweather fights again Sen. Manny Pacquiao, if that is the case I find this rematch to be impossible. Maybe another rematch to McGregor is a match he would approve, because it would be another millions in his pocket. He's amazing to achieve an unbeatable run until he hang his gloves, we can't argue about that but accepting these matches might've hit some of the boxers that wanted to face him.
Nothing is impossible, we even thought in the past that the fight would not happen, but it did happen, so the fact that they have already fought, a rematch is not impossible, probably Mayweather is just looking for the right timing, this is big money, no one would ever resist it.