I don't think its that big of a deal. The examples you listed (Roy, Byrd) were dropping 15 plus pounds to come back down. Oscar is younger than those guys, and he's only dropping less than half of that. I think 154 is his natural weight class as he always looked a bit soft at 160 IMO.

I still think Manny will have to fight PERFECTLY or De La Hoya will have to have an incredibly piss poor showing for this fight to go to Manny. Despite what people think, Oscar is not washed up. This guy just gave PBF one hell of a tough fight. He has huge 1-punch power and fast hands, and a good jab when he choses to use one. Manny has been knocked cold by 112lbers. Furthermore, I don't even think Manny is a huge puncher at 135. He had to batter David Diaz around for 9 roudns before he could stop him. I don't think Manny can hurt Oscar and with his added bulk I don't think he can dance around him for the entire fight without getting popped.