They award for effective aggression. Not just throwing punches and missing. That would be stupid.
Also, if all he does is "run his ass around the ring" surely someone would be able to cut the ring off and beat him. I mean, that's a pretty simple strategy to crack. If a guy can't make you fight his fight, he doesn't deserve to win.
Mosley landed 2 good punches in that fight. Floyd beat his ass in the middle of the ring for 11.5 rounds. He didn't run from Mosley. He didn't run from Canelo. He didn't run from Cotto. He won't run from Pacquiao.