Chuvalo fought literally all the best in the division who are also far bigger punchers, while Mayweather carefully chose his opponents and didn't even have a real chance to test his Chin...
Relax Maidana had 20 lbs on Floyd come fight. Same with Shane. Both were known for having great shots as well and Floyd still ate them
And? What's your point? I'm not saying Foyd didn't have a good chin. Read the OP. It states that Floyd was never dropped or hurt. I was just pointing out that Zab did in fact drop Floyd, but the ref did not count it and that Madiana did have him hurt. Look at how Floyd walked, or should I say, staggered back to his corner, using the rope to guide him back. Sorry to point out the fact that your hero wasn't invincible.