(1) Kakashi has Obito's Sharingan, which can control space/time and has been confirmed as a single justu. However, Kakashi is not an Uchiha and cannot access the full power or all of the abilities of his sharingan.
(2) Tobi seems to have some sort of control over Kakashi's time/space sharingan power as seen when he nullified kakashi's attack on the statue.
(3) Kakashi's time/space influence can affect Tobi, as seen with the kunai hitting him even while he was phased out. This can imply his space/time runs on the same or similar "frequency" as Tobi's space/time jutsu.
(4) Edo Tenshi is proven to be able to be self sustained if the revived person knows how it works, as seen with Madara.
(5) Edo Tenshi can revive a body to it's original form (even though Itachi's eyes were taken from him by Sasuke, he still was revived with both of his eyes) and Edo Tenshi (though not confirmed) doesn't actually require the original body, as implied by Kabuto during his meeting with Tsunade during the Tsunade Retrieval Arc.
(6) Orochimaru has been confirmed/implied to have made many experiments on humans, both alive and dead.
(7) Orochimaru has been revived (in a seemingly good/neutral demeanor) for some unknown reason, and is called by Sasuke the "Man how knows everything". (We don't know tobi's identity. Perhaps he knows?)
My Theory: Tobi is actually a failed experiment of Orochimaru's involving a Revived Obito (with his body either being recovered from the battle or another body being used as stated in point (5)) which has gotten too strong and self sustaining for Orochimaru to control. As we've seen, Kakashi's Sharingan isn't 100%, and thus the rest of his abilities could be that of Tobi's which could actually be a fully developed Obito Sharingan. Obito also died during the 3rd Great Shinobi war, so it's a good assumption he'd strive for peace after being killed during a great war; add that on top of any conditioning and mind warping from Orochimaru, and you get the current warped idea of "peace" as seen in the "Moon Eye Plan". Kakashi's influence can affect Tobi because they share the same sharingan, and vise versa. Orochimaru has also been revived for seemingly no reason, and this gives him a purpose now; a problem he originally made and is the only one who can possibly fix or (in)directly help fix. All the pieces fit in a seemingly sensible pattern.
R&R and let me know what you guys think!
Edit: With Tobi's eye more or less confirmed to be Obito's eye, this theory now has more ground as well. He said he got it at the Battle of the Kannabi Bridge, the same battle Kakashi got his eye from Obito, AND the same battle obito unlocked the sharingan in the first place. While it's true someone could have just taken the eye, this person shouldn't be able to handle the sharingan with such power. Since kakashi can't do the things tobi can do with it, it's safe to assume that Tobi is an Uchiha.
Edit2: So, Obito flash back chapter and the reveal of Obito's face (which can barely be questioned seeing as how his face on his right side kinda got f**cked by a boulder....) more or less confirms Tobi is Obito (to some extent). Years of speculation final answered, and i was right all along! xD Those feels. (Aug 29)
Edited by Sora no Senshi, 29 August 2012 - 02:42 PM.