I think it was fake, when you're knocked out cold, you don't brace yourself as you're falling down right? It was a good punch, but it didn't look hard enough to knock someone out cold.
Top Rank is exposing themselves more and more as time goes by. Now I really think that Clottey was paid off (like Mr. Cleen mentioned a while back) to lose against Pacquiao. If you watch how Clottey fought against Chico Corrales then you'll see....