Duran was miserable at 68. He reminded me of James Toney the last time he faced Sam Peter. A barrell with arms and legs. His fights with Paz were fun to watch, as two past their best fighters did the best they could because of their absolute hate for each other. Throw in Kevin Rooney's influence on Paz, and you had some fun fights to watch if you took it in the right context. All that being said, Duran vs Calzahge would be as one sided as Duran vs Joppy, probably worse if thats possible.
RedRooster is to SRL as Rico Spadafora is to RJJ and Pachilles is to Duran. All the greats have one on here. Tyson, Foreman, Ali, all of them. I haven't seen SRR get dissed too badly. He might be the untouchable.
Duran by decision. IMHO he would catch Joe early, in the 1st round, like Hopkins and Jones did. He is easy to catch with a good punch early, prone to hand injuries and open to counters. Duran was still competitive in his 40's. Duran should have won the IBC titles from Vinny Paz and Hector Camacho (he lost both fights in robberies). But I would not be surprised if Joe won. He is just good at beating old and shot legends.