"With 70 additional episodes of character development, deck development and so on, who would win at the end of the series." Yuma and handily at that. Prime Photon Dragon is nice and all but compared to all the new Hope variants (Hope Victory, Beyond the Hope, Future Hope etc.), Kaito didn't improve anywhere near as much over the course of ZEXAL II as Yuma and Shark/Nasch did. Just like how it'd be pretty hard to argue Ryo (be it as Kaiser or Hell Kaiser) still being able to beat Judai by EoS Better question would be which final rival duel is better, Yuma vs Kaito III or Yuma vs Nasch? :maybe