I would like to talk and discuss about the Rikudou Sennin.
As you know, he is the strongest ninja, the first rin'negan user, the one who finded out the ninjutsu and Jubi's jinchuriki.
I personally don't believe that he was born with the rin'negan. I'll explain what I mean.
All we know about the Rikudou Sennin's body is limited by his sons. He had two sons, the older one was born with Sennin's eyes, his powerful chakas and spiritual energy. And the younger one was born with Sennin's body, his life force and physical energy.
http://www.mangareader.net/93-31099-...apter-462.html
There are the pictures. The older one doesn't have the rin'negan. He has got an other doujutsu.
I believe that the Sennin was born with those eyes but I will explain it after.
And the younger one had the Sennin's body. (I don't mean the bodies were the same but they had the same power.) As we know Hashirama, the descendant of younger boy, had the power to tame the tailed beasts. That can explain how the Sennin could suppress the Jubi's chakra and seal it in himself.
So we can say that the Rikudou wasn't the first rin'negan user. It was the ten tails. The Rikudou had these eyes after obtained the monster's powers.
Now. Let's remember the speech between Darui and Tobito.
http://www.mangareader.net/93-35269-...apter-467.html
Tobito says that the Rikudou have divided the chakra of ten tails and created with it 9 tailed beats, and become the Moon. So Darui asks if a human being can accomplish some thing like that. Tobito's answer was simple. "As the ten tails jinchuriki," the Rikudou was already beyond what we could call "human."
As you can see Tobito wasn't talking about the Sennin. He was talking about the Sennin as the ten tails jiunchuriki. His "true power" comes from the biju. The power that is able to create. You can see the Rikudou Sennin as Neo in Matrix. Neo had a body that was able to bend the universe. So the Rikudou had the same. The ten tails was the strongest but it wasn't able to fight with the special body and the doujutsu of the Sennin. The ten tails have changed the DNA of the Sennin and thanks to this the descendants of the older one had the power to use izanagi. The techique that is able to create.
http://www.mangareader.net/naruto/594/14
The ten tails was the god but if you have studied Aristotle's unmoved mover you will understand what it really is.
http://en.wikipedia.org/wiki/Unmoved_mover
It's the begining of all, the strongest, the most beautiful, the most intelligent.
So how come a human being sealed it in himself? I don't know if you ever heard this concept. "Can God create a rock so heavy that even he cannot lift it?"
http://en.wikipedia.org/wiki/Omnipotence_paradox
I think the ten tails wanted to prove his powers, so he gave a doujutsu and a special body to Rikudou which are surpassing his powers. After the fight the ten tails was defeated.
As the jinchuriki of ten tails, the Rikudou had the power of a god. He was able to create things as the ten tails could. But I don't understand how the hell someone like him was aging??? Even the mestizo Zetsu's are immortals that aren't aging. Why the Rikudou wasn't an immortal?