I already did, but nobody believes me...
Two theories are left, in terms of probability:
1.Future Obito
2.Obito is Izuna's reincarnation, and Madara had something to do that.
I know im arrogant, but i'll stay by these, and nothing else will convince me. Theory 1 is my main one though.
The future Obito we already discussed about it.

But the second... hmm, that could somehow be.. true? As it will have both Obito and Izuna trapped inside the same body?
Dunno, for the moment I am doing some researches to establish Madara's timeline. I think this is the key to everything further related.
Why do I believe that it's Izuna.
Here Madara is very confident that it's HIS doing
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Therefore, has to be someone VERY close to him. Who else than rather his brother? Since here he's reffering to OUR plan...
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Meaning the Infinite Tsukyomi
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Now, as we know, Sasuke's been hanging around with Tobi since the Itachi fight, and even at a point Tobi's mask was down, meaning Sasuke knows as well who is behind the mask.
Now, the thing is this... Look how Sasuke and Orochimaru reffer:
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Yes, them.
Meaning it implies that there are 2 different characters.
And look how here it puts Sasuke between the 2 of them
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I know you are going to tell me that it is about the phrase "The one who knows everything", but maybe this implies a secret that combined between the two brothers it's resulting in one absolute secret.
Now, Orochimaru knows who Tobi is as well:
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This is a detail I'll have to work on...
Though my guess is that Madara met somehow Orochimaru who helped him to make Zetsu and bring Izuna back and that would explain how Kabuto knows about them and how he had acces to Madara's DNA, yet he told Tobi that he won't reveal his secret.
