I said it once, I said it twice, (might've said it a third time. I thought it a third time anyways.), but I think Mosley is the toughest fight for Floyd out there out of everyone.
the only way to beat Floyd is if you can match him or at least come close to him in terms of speed.
Ridicule Zab Judah all you want but I believe the blueprint for beating Floyd lay in the early rounds of the Zab - PBF fight.
If you can match Floyd for speed (Mosley can do that), keep your head on straight for 12 (Mosley can do that), and take into consideration being the naturally larger man at this stage (Mosley is), all formulates into Floyd's toughest fight.

I'd like to see this fight.
As a huge Floyd fan, I don't think the risk is worth the reward.
But as a fight fan, I'd love to see Floyd battle through some adversity that he'd take in a fight like this.
And hopefully turn some of the haters into fans in the process.