bottom line... its a fighting organization, no matter how much damage is shown, each punch landed is a point in the judges eyes. Silva won by catching an arm, it happens. It was a good fight that Silva would have lost on the card, but he didn't let it go that far.
alot of people neglect to realize that MMA is relatively new in the main steam, and the judges for the most part at these evens are boxing judges here in the states.. so punches/kicks add up on the card, even if massive damage isn't done.
I would like to see a rematch of this fight with Ed Herman as the ref. He at least lets there be 2-3 taps before he will stop it, to let the speculations to rest.