I'd be intrigued to see how Mayweather would deal with Williams' loooooong reach. Don't expect this fight to ever happen.
If the Pac fight falls through I think this is the fight that Mayweather will take, as long as Williams doesn't duck like he did earlier this year saying that he wouldn't be able to get down to 147 in time. I believe that this would be fairly easy work for Mayweather.
lil floyd would just fight inside with him, seen as pw makes himself smaller that way and swings, i wouldnt even wnt to watcgh this fight id rather watch both vs sergio