If there is one person who would figure out Floyd it is Whitaker. And, his workrate is more than double that of Floyd. Pea would win going away in a fight where neither man is ever close to being hurt.
Question should be would Mayweather "Dare to be great" and take the real chance of losing and get in the ring with a prime Whitaker. His history suggest he wouldn't, at least not at lightweight. Mayweather may have fought the past prime Whitaker at welterweight and won.