Monzon looks like a lightheavy and Griffith a welterweight. http://www.youtube.com/watch?v=vJ5UjbMgELE&feature=related Keep wishing Monzon would have tested the Lightheavy waters where Foster, Galindez, Conteh and company waited.
From what I know, I think his refusal to move up was because of Galindez. They were good friends apparently and did not want to fight each other.