I love that Mishima chooses to juxtapose the two. One puts Kiyoaki in a position of counterpoise (over Satoko) while the other in a position of equipoise (with Shigekuni).
P.S. While I'm on the subject of Spring Snow, let's just mention that I adore the scene on pages 9 - 10. I adore it equally as much as the scene I've just ranted about above (chapters 12 - 13).