I think Trinidad would knock Floyd out at 147, I can see him catching Floyd with a huge left hook and dropping him. Floyd would get up wobbly and Tito being the great finisher he is would pummel Floyd and force the ref to stop the fight.
After watching Cotto vs Mosley, I think Cotto has a decent chance at beating Floyd. Cotto would walk through Floyd's punches and throw fierce combinations to the head and body. This fight would be somewhat reminiscent of Floyd vs Castillo.
I'd much rather have some unknown dude come up the ranks and KO him in a tune-up for the next ODLH rematch, then have that guy get KO'd 4-5 in a row to the likes of Cotto, Clottey and Cintron.