I spend a lot of time everyday with a guy that has sparred many rounds with Floyd; he is very fast and he hits very hard when he so chooses. The thing that stands out to me is his intelligence- you don't hit him the same way twice and, if you try, he will generally make you wish you hadn't.
I think that he and Robinson, at 147, are comparable in hand speed and, at that weight, Robinson moved as well as anybody. It was after his layoff that he stood and punched more. And he was very ring savvy on his own account; through his years at 147 he fought Gavilán twice, Zivic twice, LaMotta a bunch, Servo and Angott twice, Tommy Bell twice, Georgie Abrams, Bernard Docusen, Henry Armstrong. I think you get smarter fighting those guys than you do fighting Corrales, Hatton, Ortiz.
May weather does some things- the wide stance, leaning up on his left foot to jab, leaning on the pull counter (instead of moving weight on his feet)- that he gets away with because of speed and fighting dummies. Robinson is just as fast, just as smart as well as being taller and longer. Plus, he has fought guys with styles similar to Floyd's; Floyd never fought anybody even close to Robinson.