Here's another question about Orochimaru. I'm not sure if this has been asked before, but is there a substantial possibility that Orochimaru has obtained his tailed demon from akatsuki and then decided to leave without helping the others in order to pursue the sharingan? A friend of mine was pointed out that the way the cursed seal works coupled with the appearance of its users makes it quite likely that it's power source is actually from a demon contract.