Holy shit, I just realized something while reading up on the Warring States era on wikipedia. You guys know the great general Kouen mentioned by Kanmei and the king of Chu? I think he's Xiang Yan (might need people who know the kanji for his name to confirm this though), THE Xiang Yan who
! destroys Shin's Chu campaign. I'm basing this assumption on the fact that the characters for Kouyoku (you know, the smug Chu 1000 man commander with the Bakuya sword) are read as Xiang Yi. The En part of the name is just my assumption based on the fact that "En" is translated into Chinese as "Yan" (again, I don't know the specific characters for "Kouen" so I'll need confirmation). If this is true, I'm glad that Chu finally has a historical general that is somewhat known in English (again, it's from wikipedia so… and Shunshinkun doesn't count as a general) and that Hara didn't have to supposely pull this guy out of thin air like Kanmei, Karin, and Rinbukun. Also, this Kouen could be Kouyoku's dad or something, making him kinda like Ouhon.
I also found from a footnote on wikipedia that Fan Wuji
! could be Kanki. How's this significant? Fan Wuji helped Jing Ke's assassination attempt on Ei Sei, and this is after Kanki fled to Yan because he lost to Riboku. If this is true, then I'm even more hyped for the conquest of China arcs.