1: It won't happen and it shouldn't happen because of the big size difference
2: If it's still happen (which is highly unlikely because of the above reason and because Golovkin is with HBO and far from the megafight May-Pac was) then Mayweather will be the A side and he will dictate the terms --> catchweight or 154 --> Golovkin will be drained af --> Mayweather UD him easily.
So it's either unfair because the size different or it's unfair against the other half because the weight drain. So this fight doesn't make sense at all.
If you ask me who is the better P4P, it's Mayweather and it's not even a contest but he would probably lose against such a huge puncher who two size bigger than him. No shame in that. The reason why I still picked Mayweather in a fantsy matchup that I know that if it would still materialize somehow then Golovkin would be drained af and Mayweather would outpoint him.
If floyd fight like a scared chook, just staying outside Golv punch range, like he did pacman.
Golovkin has no chance.
Judges will gift Floyd boring Unanimous decision.