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Check out the eye in the backround.
Looks like Rinnenegan, mixed with Sharingan that we've all seen before.
But in the middle is a yin yang symbol, and with the rinnenegan rings around it, it instantly made me think of Neji's 64 divine strikes technique. once I thought about it a few more seconds, every byakugan technique involves that symbol.
I'm not stating what it means, just kind of pointing it out and awaiting the ridicule
Also, in all the talk of who could hold the other paths, nobody has mentioned the tearjutsu specialist (sakura).
she is a medical ninja, yang, who was supposedly trained as a genjutsu type (yin). So she embodies both chakra naturesat once.
Okay, from reading your post.. I can relate you to a few things here:
The sage of the 6 path's eye consist of: Rinnegan, Sharingan, and Byakugan correct? But first, let's take a look at the body:
Somebody talked about Hashirama having the "body of the sage" I would say that is incorrect. The sage's body consist of: "strength of will and physical energy" I believe Hashirama only has the "will of the sage" as to what Madara refers Naruto to when they met.
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Naruto has a complete body of the sage as seen on here:
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Which means, Naruto has the "strength of will and physical energy"
Now for the descended from the younger of the two sons of the Sage of the Six Paths:
Senju and Uchiha right? Look here, there's more:
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Uzumaki is distant relatives to the Senju: Basically, Naruto is half Uzumaki (Mom) and half Senju? (Dad)
Uchiha clan's Sharingan was descended from the Byakugan (or so they say): Who the hell do we know that has all the eye tech? None.
So, should we say the reason why Madara is collecting these eyes is because he wanted to "complete" the eye by combining sharingan (EMS) / Rinnegan / (and possibly the Byakugan) which equals to:
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Who knows? Madara could be doing what Nagato was doing - in some dark room controlling his spirt through another body. This is why when you damage him, you don't see any blood. (Perhaps Zetzu plays a big part here too)
I don't believe Madara has his EMS anymore. That is why he is using Sasuke to develop a perfect EMS.
And then he can steals them... and turn to Cell... and the story goes from Naruto to DRAGONBALL Z (I'm just kidding on that part ;^D)