I feel like Hinori wasn't used well by the author, either. Even if you're not like me and don't think they should be a throuple (not sure how, HiYuMi is high-concept and extra cultured), I still think she has the sort of personality that would get frustrated and push them together fifteen chapters ago.
Also, very impressive that a random love rival brat appeared but didn't even manage to catalyse anything useful. Minami and Yuzu are like cyanoacrylate and fucking teflon.