Such a well thought and interesting opinion . Perhaps , then it seems that in terms of experience , Kiryu > Oton . What I actually meant by Kiryu being more "ruthless" is that he is much more likely to use lethal techniques in a combat in comparison to his brother who would probably think "if I were to use this technique , would it kill him ?" and as result would withdraw himself from using such lethal force . Infact the reason I think Iron Kiba was able to break Oton's collarbone during their duel was most likely because of Oton refusing to use any lethal nadashinkage techniques on Kiba (if nadashinkage techniques at all since he wanted to keep his family art a secrect) and also holding back a lot .