I can see that. When you've never had to be responsible for someone else, ever, priorities change. While Mori just moved on from being responsible for Hani to responsible for the host club people, as well, Hani was suddenly the oldest among others. (I'm oldest of three, the last of which is currently half my age. I like to think I get the whole bratty spoiled younger sibling thing, which is why I like people like Sanada and Mori so much)

Sanada was always supposed to come from a traditional family, so I always thought that he also had that certain amount of social training (from his manner, punishments, bearing, etc.) - the Japanese have really rigid social structures as compared to the west or even other asians, and Sanada+Dojo+sword and all (samurai class) - things like that firmly entrenched in my mind a Sanada who's wealthy, has classy, traditional parents and a bloodline Hyoutei students would kill for. Mori's background (actually Hani's, but the implications are clear) in the brothers storyline just clinched the comparison for me.

(Also, welcome to the Dark side of fandom, where canons cross and mingle in a flurry of crack-fics...) XD