Not sure why he would bother opening up enough to stop Charlo. Jermell could be trouble if he took something off his punches and increased the volume to make it hard to take rounds, but that might have helped him in other difficult fights and he didn't do it so...
Jermell Charlo was the type of fighter that Floyd didn’t bother fighting at the end of his career.. Prime for prime Mayweather would 11-1 or 10-2 him but the Money May after 2010 I can’t see him putting enough on his shots to keep Jermell off of him at 154. Not saying Jermell would stop him but with his style after 2010 he was carefully choosing whom to fight at 154. Size matters at some point.
So your saying the guy who couldn't beat Martirosyan without the help of the judges will KO Floyd who toyed with Canelo? Ah ok.
Will this fight be at 152 pounds? Maybe is this 23 year old Jermell? Will Jermell have shorter arms and be shorter than Mayweather?
Martirosyan is underrated at 154 though. Jermell went on a streak of KOs too. You never know, but he'd have to be on his A+++ game.