User blog comment:Bloody Bankai/The Plot and Characters in Bleach ( Spoilers inside, please avoid this post if you do not read the manga as well as watch the anime )/@comment-1659217-20091025152636

The new Zanpakutou ark: the Zanpakutou stand for instinct the Shinigami for reason

When a Zanpakutou loses to it´s Shinigami it´s resons gain control over it´s instincts.

Baykuya lost to his Zanpakutou and his instincts gained control over his reason. That´s all.