Thanks to this weeks release we are left with as many questions as we have been given answers. quick recap we have been given a glimpse behind the mask of Madara and have found out he has / had two normal sharingan's. We have found out that he didn't just challenge the 1st hokage for the leadership of the leaf but he did it to steal his power. Allowing him to become the second sage of the six paths and that Nagato was the third. We found out that Madara was the one who gave Yahiko the idea to start Akatsuki, and he was the one who gave Nagato the rinnegan. Also that Nagato was of the Uzumaki clan. And we learned that Madara has the ability to use the perfected izangi jutsu.
Questions that I have been left with is:
1) If Madara had stolen 1 st power and became a sage of the six paths, then shouldn't he have at least one eye with the rinnegan? (Seeing as how the rinnegan is the mark and dojutsu of the the sage of the six paths.)
2) Why would Madara need to take the rinnegan from Nagato if he had one of his own? And if he didn't why would he weaken himself by giving his rinnegan to a child? And the other part is since Nagato is part of the Uzumaki clan which is closely related to the senju by giving Nagato some of Madara's power wouldn't Nagato gain the powers of the Sage of the six paths without the need of an eye transplant, or was the transplant how he gave Nagato the power of the Uchiha?
Now for my theory, Okay Madara states that for one to gain the power of the sage of the six paths. One must gain full control of both the Uchiha and Senju powers. Now Naruto is part of the Uzumaki clan and the son of the fourth with a large charka pool of his own. He has gain the ability of senju arts with using nature energy. He also has taken control of the nine tail Fox which makes him probably the strongest senju ever, chakra wise. Making him strong enough chakra wise to be able to control an Uchiha's power. Now looking back to when Itachi gave some of his power to Naruto, I think Naruto now has all the pieces to become the fourth Sage of the six paths. A sage to eclipse both Madara and Nagato. Once he unlocks the power that Itachi gave him he may very well activate the rinnegan. Could Itachi be so much of a genius that he could have forseen this possiblity and set out to make the ultimate challenger for Madara? Another piece to my theory is The Uchiha has the Izangi technique that they need the power of the senju to complete and make perfect. I believe the Senju was given the Death God sealing technique, which they need the power of the Uchiha to make complete. So we may very well see a battle between the ultimate opposites one that creates life from nothing (izangi) and the other that turns life into nothingness (shiki Fujin).