Board Thread:General Discussion/@comment-13237238-20130814154922/@comment-11051098-20130814172852

I don't think he's trying to create a "second Espada". But he could have gathered enough information from the bodies he collected and probably experimented on, to be able to create a kind of being that has all advantages on its side, and no disadvantages.

Or he could be attempting to resurrect a dead Shinigami, e.g. Unohana, and use information he's gathered to remove any disadvantage she might have had and make her stronger and able to withstand anything the Stern Ritters could possibly do.