Also the conversation is weird: we had sex several times but you can't be my woman because we're family
While I appreciate the bit of spotlight Rin Gyoku and Shu Ma and his clan got, I don't think Hara has been making many good decisions regarding the Kan Ki Army.
For me, it started when he revealed Kan Ki's supposed weakness was that... he didn't know strategy? Setting aside the fact Kan Ki is a genius who spent a decade and change around the likes of Mou Gou and Ou Sen and commanded an army of (tens of?) thousands of bandits before that - considering how much Kyou Kai has absorbed by sheer passive interest and intellect, it frankly doesn't make much sense Kan Ki doesn't have a deep understanding of the subject.
I suspect we will soon get the final piece of the puzzle to Kan Ki's past in his final moments, though whether he talks to Ri Boku or it's just a flashback in his head remains to be seen (I think the latter). Whatever it is we are likely to learn of Kan Ki, I don't think it'll redeem what has been otherwise been a series of pretty underwhelming revelations and disappointing flashbacks.
