This should be Pacmans win all the way. The only worry I have is if Mosley connects with a punch or two like he did with Mayweather, Pac tends to add more flurry of punches of his own instead of backing off and dancing around as he recovers like Mayweather did. So if Pac gets hit and attacks, he could get hit a few more times and that's how he'd get hurt or even lose. Pac has taken punches from Cotto though that didn't seem to bother him in the match so who knows if Mosley can punch as hard or as fast before Pac beats the crap out of him.
My prediction, Pac in 8 via KO or TKO.