Well Orochimaru was...unique that is true and kind of...weird hehe but anyways I have also considered the chance of him coming back through Kabuto.Maybe when Kabuto gets defeated or when he get's too much of Orochimaru chakra and then he won't be able to control the cells.
This battle will surely be interesting!We all know about how strong Hanzo is but we've got nothing on Mifune.I think that we might be surprised from the samurai leader.Personally from what I saw during the Five Kage Summit samurai were no match for the shinobi.And we've only seen their Saber...