After Arguello moved up, there was a kind of fabulous four at jr. lightweight: Boza, Navarrete, Limon, and Chacon.
Limon and Navarrete each fought the other three, and both Chacon and Navarrete fought Boza and Limon, but Bobby and Rolando never fought.
I'd lean towards Chacon in a war where there's a massive amount of blood lost.