GGG is far too big and looks like he`s improving his head movement, he would have finished Conor far quicker than Floyd did.
The key thing is the power and accuracy of GGG's jab. It would land on Mayweather and slowly break him down.
If GGG landed clean then it would have a very big impact on FM as he is much much smaller than GGG. However, FM would just fight defensively and pot shot to a clear victory. Some may call it "boring", others would call it a masterclass and complete domination.
You're delusional if you think that Floyd could pot shot for 12 and not get touched a few times. GGG is a master ring cutter and his power jab will hurt Floyd if it lands. Cotto had a lot of success with his jab and it's nowhere as good as Golovkin's.
Prime, I think G would impose himself and win a decision. Mayweather imo is just not big enough for this matchup.
GGG has never had the speed to keep up with Floyd. Nor is his jab ever been fast enough to consistently land on Floyd. Yes, GGG may land a punch here or there, but Floyd is the master of defence. Maybe you should stop being delusional about certain boxers greatness! There is no way ATG Floyd Mayweather would fight GGG like he did Cotto. Use your brain (if you have one). LOL
See how they each looked against Canelo. GGG’s lack of head movement would make him such an easy target for lead right hands.
GGG's overhand right and overhand right would knock Mayweather out. It's the two punches that Mayweather can't defend well against and GGG has used those to seriously hurt a number of fighters. Maidana effectively used the overhand right to catch Mayweather. If GGG lands one, Mayweather going to get hurt.
Maidana's overhand is completely different to GGG. Maidana's comes down at a much sharper angle and hits you on the back on the head if you attempt to duck it. He uses a lot of leverage at extremely close range to do it, GGG doesn't throw overhand's at that range. Also Canelo made GGG look slow to the point GGG had to rely on jabs to consistently land. 36 yo Floyd made Canelo look slow, imagine what a prime Floyd would do. For GGG to land that overhand he has to get in close and grab him, and fight dirty. If he ignores boxing, ignores what comes his way and uses one hand to hold Floyd and the other to throw shots he wins this easy, if he tries to box off of jabs he'll get embarrassed.