If Castillo loses, definitely. Lets say for some reason Corralles fought Freitas in his next fight back because Castillo gets tired of waiting around and goes after Cotto instead. Now lets say Corralles gets KTFO in the third round by Popo. You could then make the case that Diego is finished. Even so, I still think they'd fight the third fight for the money at some point but Corralles getting crushed and Castillo moving up for good are the only ways I see it not happening. Clearly though, the boxing community is not clamoring for a third fight. Most of us would happily watch it but its not an enticing rubbermatch at this point in time. Three in nine months is a bit much too soon. Maybe letting it build up some more will be good