Floyd doesn't need defending, pacman doesn't have a thing for him not now, not in the past, not ever. No one has ever given floyd that much trouble not even de la hoya (how that was a split is beyond me). Manny got his lights switched off against marquez not long ago, robbed marquez before that and looked average against bradley even though he should have won. The only people that can beat floyd are at higher weight classes.
I'm not going to get into it all, especially with you
But the problem is, Mayweather will ALWAYS have Pacquiao's name attached, Pacquiao wont. Pacquiao has had some wars in his career, and some amazing exciting fights. He also has 4 epic fights against JMM. People will remember this stuff alone, and Mayweather will be an after thought. Mayweather doesn't have this. He has made great opponents look bad, which means people can forget the fight even happened. His fights are generally unmemorable, meaning that if someone is reviewing his career, there is a lot more room for "what if?".
Pacquiao was fighting guys that go against him stylistically. Mayweather wasn't doing this for a while, although he did earn my respect for fighting Canelo. Pacquiao looks terrible against guys who don't come forward. That means Bradley, JMM, Clottey and the run away version of Mosley all were difficult fights for him to look impressive in. Thats why people are talking about Rios so much. He comes forward, and Pacquiao did what he always does.
I'm actually looking forward to the Khan fight. 99% of the time, you give this to Floyd. 70% of those times, it's by KO. But Khan imo is faster than Mayweather. I gave Canelo a lot of rounds because Mayweather wasn't coming forward and didn't really counter much, and Canelo just seemed the more aggressive. If Khan can take advantage of these rounds, he can use his speed to impress the judges. It's a long shot, but it's not a punchers chance like Hatton, Oscar, Cotto etc. I do see a slight way that Khan might be able to win (as I did with Canelo), so I like when Mayweather takes these guys on.