User blog comment:Xilinoc/Ch. 611 - The Soul King Dies (edgy as ever, Kubo)/@comment-24963493-20141228090000/@comment-5398287-20141229072628

You're entirely correct, and a few other users have brought up that point as well; I just ran with the "biological connection" inference because it made the most sense to my sleep-addled mind at the time.