Yeah, Ko-kun ... now do your damn duty and spread that Yatagahane seed all around the world. You have the harem and the means to do this ... well ... get started already.
Also, Genryusai does not have to pass on ... if Yuuna possesses Chisaki permanently the baby they would have with Kogarashi would be off the charts in terms of power. They would be a direct descendant of both the Yatagahane and the Genryusai families. Hell, they could have a couple ... several ... a football team ... ah who am I kidding ... they could form an entire NEW clan with all the ladies in the inn.
Also also, the psychic lady may be the next big bad but she may also be guiding things to a harem end ... only time will tell.