Disclamer : Before you read this, let me say that most of the material here is very speculative. I doubt that Kishi will ever use this idea in his story. But, it's still pretty mindblowing and I would appreciate it if you read it to the end. 
A) The Three Celestial Gods :-
B) A Greater Being :-
C) The One :-
D) The Juubi :-
E) The Juubi's Central Eye :-
The Juubi's central Reddish eye is mystical. We have no idea why it exists except as a medium to Cast Infinite Tskyumoni.
According to Obito, "Infinite Tskyumoni makes everyone one".
If we take his statement and the point above, it stands to reason that the central eye is The One's Eye because it fuses everyone into one being via Infinite Tskyumoni.
How is the Juubi's eye created :-
I think the Red Central Eye is born when you combine all three Celestial god's powers namely Kaguya, Sobojo and Shinju's powers.
F) The True Origin of the World :-
G) The Cryptic Warning :-
A) The Three Celestial Gods :-
In the Naruto Verse, Two gods have been shown and I believe a Third God will be revealed.
I wouldn't explain this much as I and many others have made theories about this. But, in a nutshell :-
There were three celestial gods involved in the Creation of NV. They were :-
1) Shinju, the God Tree representing Creation and the Earth. (Already shown in the manga.)
2) Kaguya, the Rabbit Goddess representing Maintainence and Preservation. She is represented by the Sun. The Byakugan and Red Hair are connected with the Sun.
(Already shown in the manga, the Sun part has not been shown).
3) Sobojo, the Tengu God representing Destruction and the Moon. He is sealed within the Shinju's fruit and is the origin of the Sharingan's power.
(While he has not been shown in the Manga, if you have read Tethows Youth Group's Theory, you will pretty much know who Sobojo is).
Link below, in case :-
I wouldn't explain this much as I and many others have made theories about this. But, in a nutshell :-
There were three celestial gods involved in the Creation of NV. They were :-
1) Shinju, the God Tree representing Creation and the Earth. (Already shown in the manga.)
2) Kaguya, the Rabbit Goddess representing Maintainence and Preservation. She is represented by the Sun. The Byakugan and Red Hair are connected with the Sun.
(Already shown in the manga, the Sun part has not been shown).
3) Sobojo, the Tengu God representing Destruction and the Moon. He is sealed within the Shinju's fruit and is the origin of the Sharingan's power.
(While he has not been shown in the Manga, if you have read Tethows Youth Group's Theory, you will pretty much know who Sobojo is).
Link below, in case :-
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B) A Greater Being :-
Moving on, If you think that Point "A" makes sense then eventually you would ask yourself a question which is :-
" Is there a being greater then the Three Celestial Gods ? "
I thought about it and dismissed it until the Earth-shattering relevation by Black Zetsu :-
"Kaguya and the Shinju are one being as the Juubi".
(Notice the focus on the Juubi rather than the Shinju ? I will explain later.)
Kishi basically revealed to us that two celestial gods power's were combined to create the Juubi, namely Kaguya and Shinju.
And to me this was pretty mindblowing as it opened up the possibilities to a Greater Being.
But wait, According to Point "A" and Tethows Youth Group's Theory, Sobojo is sealed within the Shinju's Fruit.
Going by the above logic, we can assume that the Three Celestial God's powers have been combined in One Being (Albeit in sealed states). Because the fruit was a part of the Shinju.
Sobojo as the Fruit and Kaguya and the Shinju were one being as the Juubi.
Thus, we see there is a Greater being in existence who was created when the powers of the Three Celestial gods were combined.
" Is there a being greater then the Three Celestial Gods ? "
I thought about it and dismissed it until the Earth-shattering relevation by Black Zetsu :-
You must be registered for see images
"Kaguya and the Shinju are one being as the Juubi".
(Notice the focus on the Juubi rather than the Shinju ? I will explain later.)
Kishi basically revealed to us that two celestial gods power's were combined to create the Juubi, namely Kaguya and Shinju.
And to me this was pretty mindblowing as it opened up the possibilities to a Greater Being.
But wait, According to Point "A" and Tethows Youth Group's Theory, Sobojo is sealed within the Shinju's Fruit.
Going by the above logic, we can assume that the Three Celestial God's powers have been combined in One Being (Albeit in sealed states). Because the fruit was a part of the Shinju.
Sobojo as the Fruit and Kaguya and the Shinju were one being as the Juubi.
Thus, we see there is a Greater being in existence who was created when the powers of the Three Celestial gods were combined.
C) The One :-
So, What is this Greater Being ?
Now, to be honest, I got this idea from another story, namely the "Animorphs".
In this story, there are two ultimate beings, The Ellimist who helps the Protaganoists.
The Second Ultimate being is revealed in the later chapters and this was his description as far as I remember :-
" The being was enormous. His body was Gigantic. But what filled me with Fear, was by looking at his Central Reddish eye. This being was called - "The One" ."
Here we see a being called "The One". And to be honest, his description matches very well with a being from the Naruto story :_
You guessed it right, The One's appearance is similar to the First form of the Juubi.
The First form of the Juubi :-
1) Is Gigantic.
2) Has a central reddish eye.
Now, to be honest, I got this idea from another story, namely the "Animorphs".

In this story, there are two ultimate beings, The Ellimist who helps the Protaganoists.
The Second Ultimate being is revealed in the later chapters and this was his description as far as I remember :-
" The being was enormous. His body was Gigantic. But what filled me with Fear, was by looking at his Central Reddish eye. This being was called - "The One" ."
Here we see a being called "The One". And to be honest, his description matches very well with a being from the Naruto story :_
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You guessed it right, The One's appearance is similar to the First form of the Juubi.
The First form of the Juubi :-
1) Is Gigantic.
2) Has a central reddish eye.
D) The Juubi :-
I think the Juubi is The One in a sealed state.
The One was revived in the Fourth Shinobi World War in the form of the Juubi (Obviously neither Madara or Obito realised this) as it's components were sealed .
But, as we know, The Shinju was released by Obito.
Kaguya was revived by Black Zetsu.
And Sobojo would be eventually released when the Fruit ripens.
The above could lead to the full revival of "The One".
The Juubi in it's Second form looked like it was mutating into the Shinju and gaining tree like characteristics. It looked deformed and twisted.
The Third form is pretty much an enlarged form of the Second, when it absorbed too much natural energy.
Not to mention, there are a few inconsistencies in The Juubi's transformations as pointed out by Fear X Death :-
The above shows that the Juubi was kinda not fitting in with the Shinju which makes it look like a separate entity.
The One was revived in the Fourth Shinobi World War in the form of the Juubi (Obviously neither Madara or Obito realised this) as it's components were sealed .
But, as we know, The Shinju was released by Obito.
Kaguya was revived by Black Zetsu.
And Sobojo would be eventually released when the Fruit ripens.
The above could lead to the full revival of "The One".
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The Juubi in it's Second form looked like it was mutating into the Shinju and gaining tree like characteristics. It looked deformed and twisted.
The Third form is pretty much an enlarged form of the Second, when it absorbed too much natural energy.
Not to mention, there are a few inconsistencies in The Juubi's transformations as pointed out by Fear X Death :-
By Fear X Death.
The Story of the Bi-Polar Entity :-
Now this is something I came across that weirded me out. Now follow me closely.
Obito Unleashes the Juubi/God Tree :-
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Obito is defeated, Madara is revived, He starts kicking ass and taking names and all of a sudden.
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Was that the Gedo Mazou? Thats kinda weird I thought that became the Juubi and that is now the God tree... whatever.
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Wait a minute... Madara just summoned the Juubi and then absorbed it? Making him the Jinchuriki... So then... Wait.. So what happened to the Tree? I guess it was summoned to Madara along with the Juubi since their one in the same?
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NOPE!!! So then what the HELL is going on here? How can the Juubi and Holy Tree be in 2 places at once, and dont even get me started on what the Gedo Mazou was doing over there when we clearly saw it become the Juubi.
The above shows that the Juubi was kinda not fitting in with the Shinju which makes it look like a separate entity.
E) The Juubi's Central Eye :-
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The Juubi's central Reddish eye is mystical. We have no idea why it exists except as a medium to Cast Infinite Tskyumoni.
According to Obito, "Infinite Tskyumoni makes everyone one".
You must be registered for see images
If we take his statement and the point above, it stands to reason that the central eye is The One's Eye because it fuses everyone into one being via Infinite Tskyumoni.
How is the Juubi's eye created :-
I think the Red Central Eye is born when you combine all three Celestial god's powers namely Kaguya, Sobojo and Shinju's powers.
F) The True Origin of the World :-
This is where it all began, and this is where it will all end, namely "The One".
1) The One is the Ultimate Being and split himself into Sobojo, Shinju and Kaguya.
2) When the Shinju sealed Sobojo in the fruit and Kaguya became a part of it, The Central Red Eye or the One's eye was born in the Shinju. The Shinju was transformed into the Juubi, The One in a Sealed State.
3) In the War, The One was revived in the form of the Juubi. Eventually the sealed components were unsealed. The Shinju was released, Kaguya was revived and Sobojo would be eventually released from the Fruit.
4) If the three celestial gods in their unsealed state re-combine their powers, then The One will be truly revived.
5) If "The One" is fully revived, then the world will truely come to an end, because everyone will become "One" as it was in the Beginning.
1) The One is the Ultimate Being and split himself into Sobojo, Shinju and Kaguya.
2) When the Shinju sealed Sobojo in the fruit and Kaguya became a part of it, The Central Red Eye or the One's eye was born in the Shinju. The Shinju was transformed into the Juubi, The One in a Sealed State.
3) In the War, The One was revived in the form of the Juubi. Eventually the sealed components were unsealed. The Shinju was released, Kaguya was revived and Sobojo would be eventually released from the Fruit.
4) If the three celestial gods in their unsealed state re-combine their powers, then The One will be truly revived.
5) If "The One" is fully revived, then the world will truely come to an end, because everyone will become "One" as it was in the Beginning.
G) The Cryptic Warning :-
Kurama, during the Gedo Mazou's transformation to the Juubi gives a Cryptic Warning to Naruto and his Team revealing that :-
(See Bottom most Panel).
"Grandpa Rikudou said that the Juubi's Complete revival will signal the End of the World."
I highly doubt that Hagoromo was referencing to the Shinju as it is a source of Creation and not a source of "The End of the World".
So, was Hagoromo referencing to "The One" ?
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(See Bottom most Panel).
"Grandpa Rikudou said that the Juubi's Complete revival will signal the End of the World."
I highly doubt that Hagoromo was referencing to the Shinju as it is a source of Creation and not a source of "The End of the World".
So, was Hagoromo referencing to "The One" ?
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