He probably hurt his hand because Margaritos loaded gloves were banging on them under his high defensive guard
Why the hell do people think Clottey would win easy? This would be one of those fights where Clottey might land the better punches, but Berto might get the decsion base off of activity and everyone would scream robbery. Either way, this would be a relatively close fight. Berto's speed would cause Clottey to be pretty defensive which would prevent Clottey from ever winning a wide decision. A KO is highly unlikely as well.