Board Thread:Naruto Discussions/@comment-2245550-20160501143136/@comment-734582-20160503074157

X29 wrote:

What? Orochimaru was trying to recreate the Rinnegan. Danzo had shin's sharingan-embedded arm and alluded to a power beyond Uchiha and Senju. While the situation implied he meant Izanagi, clearly regular Uchiha can use that too.

Orochimaru was aware that the power of the Sage of Six Paths could be awakened from mixing Senju and Uchiha DNA. He's been trying for ages. Shin's body makes no sense unless you realize he tried to awaken Rinnegan and put as many Sharingan as he could into Senju flesh.

Finally, as Kabuto revealed to Madara, they were aware of almost everything he had done. And that's why Kabuto had reason to cooperate with Obito: To obtain rinnegan. Note that Kabuto says he's like the Sage of Six Paths with his enhancements and that all those enhancements in fact were already being studied.