So, I have a theory about this that I want to throw out there. I really struggle with the idea that Genji, Kumasawa, and especially Dr. Nanjo would be so loyal to Kinzo if they had witnessed Beatrice 2 going through pregnancy of an incest child. Nanjo especially doesn’t seem like he could have been bribed in to silence on something like that.
It also hurts my brain to imagine that Genji would just see that sort of full on statutory rape and decide ‘whelp, better help the boss get a second go at it. Because I’m furniture.’ I mean, there’s loyalty and then there’s whatever that is supposed to be. It really doesn’t match his personality either in scenes as Genji, or even the ‘Ronove’ personality that might be his ‘dark side true self’ as imagined in the tales.
So let’s try this:
Kinzo believed that the soul of Beatrice 1 transferred into Beatrice 2 because of similarities in appearance and character, and also because Beatrice 1 died during childbirth. Because of that, when Beatrice 2 died, Kinzo or Genji had the idea that the miracle could be replicated by finding an orphan of an appropriately recent birth from Fukuin house.
I suspect this theory will be unpopular, but I’m not sure that there’s anything that can actually knock it down completely.