I have the fight on DVD n to me it looks like Oscars jab gave Floyd issues for the first half of the fight. Oscar didn't bust Floyd up with it or land it at will, but he used it to push Floyd to the ropes and keep Floyd at a distance that made him less effective. I remember Cotto having his best success against Floyd with his jab. I see the following three weapons/tactics troubling Floyd from past fights:
1) Jab: I thought Oscar and Cotto both had success and caught Floyd with their jabs. Floyd likes to slip and counter and a good jab will keep him at a distance that doesn't allow him to counter as easily as guys pounding away in the inside.
2) Unorthodox speed: Zab gave Floyd some very uncomfortable moments over the first four rounds. Floyd is a much better fighter and made the adjustments, but I don't recall another fight where I saw Floyd as hesitant and gun shy. This fight and the Castillo/Maidana fights make me feel Manny actually has a chance to win (Floyd should be heavily favored though).
3) Effective mauling/brawling: Castillo and Maidana were very successful using these tactics and lost close decisions. Hatton and Jesus Chavez both had success early as well before running out of gas and being picked apart by Floyd (two great performances by an ATG master).
Khans best chance for success is to use the jab and mix in the movement to eke the decision out. Floyd will come on strong down the stretch, so Khan needs to force the fast pace and make up his mind that he will do whatever it takes to see that final bell. I don't see Floyd having the power to stop the chinny Khan, but I NEVER thought Whitaker would do what he did to Hurtado, so who knows?
Again, Floyd should be heavily favored to win but Khan and Manny are the only two guys I see having a realistic chance at beating him 154 and down.