If Floyd retired now he'd have one of the best undefeated records in history.

Undefeated records mainly concern prospects/novice champions. It's rare for a fighter to retire unbeaten and be considered a great.

Nobody considers Ottke a great (or unbeaten).. Floyd is a proven great whether he faces Mosley/Pac or not. Even if you try to pick holes in his resume, the man has been top 10 P4P ranked for ten years. How can a fighter be considered one of the very best in the world for such a time without being a great?