Katsidis presses Floyd early, might have a moment or two, and gets stopped in about 8. See Jesus Chavez vs Floyd, though Chavez is somewhat better than Katsidis. A level vs C level here.
He didnt suck when he destroyed Ndou at 135 in one of his best performances. I dont see any way in hell that Katsidis lasts the distance with Floyd. Floyd wouldnt run from him. He'd stand his groud and destroy him with counters, and would eventually knock him out with a check hook.
That was the 130Lb'er Phillip N'Dou, Katsidis is bigger and more powerful. Having said that, he gives far too many opportunities for Floyd and gets stopped.