Not sure. Because I'm the only person in the world shipping them? Most people ship Isane with Unohana and think she's hopelessly a lesbian. I don't know, when I read the manga I got motherly vibes from them and not a Soi Fong-like one-sided crush like a lot of folks see. *shrugs*

I prefer to think it's a crack pairing so people wouldn't look at me like I'm high or something if I ever write HanaIsa fics.