Right, His chin is good enough when combined with his defense. Iron chin = Gets hit a lot of times with hard shots in a fight but does not get Knocked out. Example Guillermo Jones, Provodnikov, Mariusz Wach
Roy's chin was average in his prime, not iron. He took shots from Toney, Griffin, Ruiz and Tarver that would have taken him out after the Tarver KO.. It went downhill for sure, but the Del Valle knockdown lets you know it wasn't iron.. It certainly wasn't glass though. He would have been knocked out before going from 154 to HW.