This Theory will focus on what role Madara Uchiha could play in Part 3. You may think Madara is dead, but I will try to show otherwise. I think a few people were waiting for this (Complex comes to mind), but I mostly made this to expand my points that I posted in minamoto's Madara's threads.
Madara's Relevance
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Here's a Translation from Orochimaru's databook and an interpretation foreshadowing his goals :-
Madara's Relevance
First off, we all know that Madara's body has a huge amount of secrets related to the Rinnegan and Juubi. So, much so that Tobirama hid Madara's body away until Black Zetsu found it.
Obito's body had the secrets of Dual Kamui. Kishi eventually uses Kaguya as a plot device to destroy Obito's body.
But the same didn't happen to Madara. The fate of his body is completely unknown. These are the last panels of Madara in the Part 2 Series.
The lack of closure to Madara's body is glaring as we already know what happens when bodies are not disposed off. (Above ^ Irony comes; If Tobirama had disposed off Madara's body; the Juubi would not have being revived).
When, Kaguya was hit with Chibaku Tensei, It's important to note that only the Gedo Mazou was sealed.
The Nine Bijuus separated.
Kaguya, the Rabbit Bijuu separated.
And Madara also separated.
But, here rises an inconsistency. If Kaguya was not sealed away, where did she go ? This is where something comes in which you might have missed. Trust me, even I missed it, Credits goes to the one who originally posted it.
That is Kaguya transferred herself into Madara. Why do I say so ? First look at the Spirit fluffy material Kaguya is formed from.
Kaguya then spits Madara. These are the Gravity lines showing Madara falling down.
Then suddenly these lines are replaced by a white spirit like fluffy substance.
This shows Kaguya immediately escaping to Madara. At that point, Kaguya didn't have the Juubi's/Gedo Mazou's evil chakra as that got sealed, so Naruto will not be able to sense Kaguya. .
Madara was the perfect vessel for Kaguya; which is why Black Zetsu used Madara as Kaguya's vessel.
Kaguya's escape mirrors how Kaguya transferred her will to Black Zetsu right before Hagoromo and Hamura's Chibaku Tensei.
Madara's Rinnegan was not sealed away as many people think. In the initial drafts of the manga, there is no Hashi Face on Madara's chest which implied that Madara's Rinnegan was sealed.
But later on, the face re-appears in the final draft of the manga showing that Madara's Rinnegan was not sealed away.
Perhaps Kishi changed his mind to bring Madara back in Part 3 ? But how does that work here ?
Well, this is where comes a revelation. Madara's Rinnegan can bypass the Sun and Moon Chibaku Tensei Seal. This information was only known to Madara (Who is MIA), Obito (Who Died) and Black Zetsu (Who was sealed away). Thus, no one knows that Madara's Rinnegan can summon the Gedo Mazou by bypassing the Chibaku Tensei seal.
If this happens, the Juubi will be revived once again as the Gedo Mazou would get summoned from Sasuke and Naruto's Chibaku Tensei by Madara's Rinnegan. But does anyone know this ? I suspect Orochimaru and Kabuto perhaps knew this because of thier research on Madara (Remember, Black Zetsu handed over Madara's body for Edo Tensei and research to Kabuto).
A question now arises if we take this in mind. Is Madara still alive ? I would say yes. Even though the Juubi was extracted, Kaguya, a part of the Juubi did enter Madara.
Madara would still be alive though extremely weakened and in a coma, just like what happened with Obito and Hagoromo.
Because of Sasuke's sudden Revolution, nobody got the time to check if Madara was still alive. Madara could have very well being in a near-death state and Sakura, the only medic could have figured it out, that is if she was knocked out by Sasuke's Genjutsu.
(Zabuza escaped Kakashi and Team 7 by taking a near-death condition caused by Haku's needles)
The Sakura and Madara connection is best summed up by this picture.
Madara's body with Kaguya's spirit is free for the taking; (This is how the Kaguya transfer to Madara happened)
By none other than Orochimaru. Foreshadowing of Rinnegan Orochimaru ?
With so much power, Orochimaru The Serpent;
Can easily surpass Kaguya, The Rabbit.
Orochimaru has a connection with Kaguya which is shown by the Snake eating the Rabbit.
With the Gedo Mazou at his disposal, Orochimaru's plan will start to unfold.
First the Juubi.
Second the God Tree.
And Finally the God Tree's Fruit.
With the God Tree's Fruit, Orochimaru can fulfill his final Dream (You may have forgotten this panel).
"To become The Ultimate Being In Existence".
You must be registered for see images
Obito's body had the secrets of Dual Kamui. Kishi eventually uses Kaguya as a plot device to destroy Obito's body.
You must be registered for see images
But the same didn't happen to Madara. The fate of his body is completely unknown. These are the last panels of Madara in the Part 2 Series.
You must be registered for see images
You must be registered for see images
The lack of closure to Madara's body is glaring as we already know what happens when bodies are not disposed off. (Above ^ Irony comes; If Tobirama had disposed off Madara's body; the Juubi would not have being revived).
You must be registered for see images
When, Kaguya was hit with Chibaku Tensei, It's important to note that only the Gedo Mazou was sealed.
You must be registered for see images
The Nine Bijuus separated.
You must be registered for see images
Kaguya, the Rabbit Bijuu separated.
You must be registered for see images
And Madara also separated.
You must be registered for see images
But, here rises an inconsistency. If Kaguya was not sealed away, where did she go ? This is where something comes in which you might have missed. Trust me, even I missed it, Credits goes to the one who originally posted it.
That is Kaguya transferred herself into Madara. Why do I say so ? First look at the Spirit fluffy material Kaguya is formed from.
You must be registered for see images
Kaguya then spits Madara. These are the Gravity lines showing Madara falling down.
You must be registered for see images
Then suddenly these lines are replaced by a white spirit like fluffy substance.
You must be registered for see images
This shows Kaguya immediately escaping to Madara. At that point, Kaguya didn't have the Juubi's/Gedo Mazou's evil chakra as that got sealed, so Naruto will not be able to sense Kaguya. .
Madara was the perfect vessel for Kaguya; which is why Black Zetsu used Madara as Kaguya's vessel.
You must be registered for see images
Kaguya's escape mirrors how Kaguya transferred her will to Black Zetsu right before Hagoromo and Hamura's Chibaku Tensei.
You must be registered for see images
Madara's Rinnegan was not sealed away as many people think. In the initial drafts of the manga, there is no Hashi Face on Madara's chest which implied that Madara's Rinnegan was sealed.
You must be registered for see images
But later on, the face re-appears in the final draft of the manga showing that Madara's Rinnegan was not sealed away.
You must be registered for see images
Perhaps Kishi changed his mind to bring Madara back in Part 3 ? But how does that work here ?
Well, this is where comes a revelation. Madara's Rinnegan can bypass the Sun and Moon Chibaku Tensei Seal. This information was only known to Madara (Who is MIA), Obito (Who Died) and Black Zetsu (Who was sealed away). Thus, no one knows that Madara's Rinnegan can summon the Gedo Mazou by bypassing the Chibaku Tensei seal.
You must be registered for see images
If this happens, the Juubi will be revived once again as the Gedo Mazou would get summoned from Sasuke and Naruto's Chibaku Tensei by Madara's Rinnegan. But does anyone know this ? I suspect Orochimaru and Kabuto perhaps knew this because of thier research on Madara (Remember, Black Zetsu handed over Madara's body for Edo Tensei and research to Kabuto).
You must be registered for see images
A question now arises if we take this in mind. Is Madara still alive ? I would say yes. Even though the Juubi was extracted, Kaguya, a part of the Juubi did enter Madara.
You must be registered for see images
Madara would still be alive though extremely weakened and in a coma, just like what happened with Obito and Hagoromo.
You must be registered for see images
Because of Sasuke's sudden Revolution, nobody got the time to check if Madara was still alive. Madara could have very well being in a near-death state and Sakura, the only medic could have figured it out, that is if she was knocked out by Sasuke's Genjutsu.
(Zabuza escaped Kakashi and Team 7 by taking a near-death condition caused by Haku's needles)
You must be registered for see images
You must be registered for see images
The Sakura and Madara connection is best summed up by this picture.
You must be registered for see images
Madara's body with Kaguya's spirit is free for the taking; (This is how the Kaguya transfer to Madara happened)
You must be registered for see images
By none other than Orochimaru. Foreshadowing of Rinnegan Orochimaru ?
You must be registered for see images
With so much power, Orochimaru The Serpent;
You must be registered for see images
Can easily surpass Kaguya, The Rabbit.
You must be registered for see images
Orochimaru has a connection with Kaguya which is shown by the Snake eating the Rabbit.
You must be registered for see images
With the Gedo Mazou at his disposal, Orochimaru's plan will start to unfold.
First the Juubi.
You must be registered for see images
Second the God Tree.
You must be registered for see images
And Finally the God Tree's Fruit.
You must be registered for see images
With the God Tree's Fruit, Orochimaru can fulfill his final Dream (You may have forgotten this panel).
You must be registered for see images
"To become The Ultimate Being In Existence".
-----------------------------------------------
Here's a Translation from Orochimaru's databook and an interpretation foreshadowing his goals :-
