Floyd's style is not difficult to figure out. His guard is low so even when he blocks the punch still lands partially. If you keep jabbing and probing without overextending yourself he will not have anything to counter. You can time that shoulder roll for when it resets as well.
The problem is Floyd is smart and makes adjustments...so the real question would be whether Roach and Pacquiao can force Mayweather to adjust in the manner they want.