It probably won’t happen, mainly because Mayweather is naturally bigger than Manny. Maybe if Mayweather comes in unprepared there’s a chance, but if he trains properly and stays in shape like Manny, then it’s hard to see that result changing. That’s just how I see it.
Is there any boxer that goes to the ring without preparations? I doubt. The thing is this, like they say, every boxer has a plan until they get punched in a critical area that distablizes them. BTW, you make it sound like Pacman is a midget or in a lower pound category. We've seen bigger boxers lose to their opponents. So, I don't see any issue with that.
Even if a lot of us don’t enjoy his defensive style, looking at his past fights, he’s always been very slick and disciplined.
You might not like how he fights, but it’s effective.
For me, it's not even about that he's defensive or something. It's about how he tries to steal points by hitting opponents when referees come to break fight. That's cheating. I know that judges let that slide most times. Maybe because it's Mayweather, the Mayweather effect or something.