Board Thread:General Discussion/@comment-5405361-20130408110659/@comment-5398287-20130408233559

Um...first off, his Zanpakuto wouldn't cause any of that. Secondly, any type of Zanpakuto that isn't melee falls under Kido, which Zangetsu does not. If it had ever displayed any ability relating to the concept of darkness, then perhaps your theory would be somewhat valid, but it is a melee-type, not a Kido-type, and it is most definitely not a darkness-type.