Mayweather would be the safest opponent for Manny if a rematch ever materializes, but I doubt Floyd is open to the idea. Based on Manny’s performance against Barrios, I believe Floyd won’t take the fight, especially considering he’s already 48 years old, older than Manny, and likely no longer in boxing shape.
We haven’t even heard anything from Mayweather lately, not even an exhibition fight. He’s probably just enjoying retirement and doing his own thing.
And if he’s not in shape, no way he’s gonna agree to fight. He’s all about protecting that undefeated record, that’s really the only legacy he’s got in boxing, since a lot of people don’t even like his style. They find him boring in the ring.