So Kagami's zanpakuto is effectively a fairy from Legend of Zelda? ("HEY! LISTEN!") I'm a bit leery on the fluff surrounding it's current state, but you could just say it's an inconvenient unconventional constant release resulting from am arrogance-induced screw up.

Maybe 13th? I'd love to have a new guy for Hachirou to boss around... maybe have his transfer happen on-screen when the Kujo plot start to cool down?