Okay, this has been bothering me for a while... so i did a little research around NB but no one seemed to mentions one particular thing about Tobi's identity...
Lemme start...
We've all heard the various theories about Tobi right? Tobi's Madara, Tobi's Zetsu, Tobi's Obito, Tobi's not even an Uchiha.
I think Tobi's actually Izuna, Madara's little brother... Why?
Okay, that's from the chapter where Itachi explains MS and EMS
Itachi's and Sasuke's relationship is like all Uchiha brothers, thus making the relationship between Madara and Izuna the same.... With the elder brother caring for the younger, (Itachi forcing Sasuke into Power, Madara unwillingly taking Izuna's eyes)
Now lets assume Sasuke is just like Izuna
If their times where reversed (Sasuke and Itachi were founders of the Uchiha clan) do you think Sasuke would have let a completely blind Itachi take his eyes? No... Itachi wouldn't too."What kind of Brother will willingly hurt his younger brother" these are Madara's words. So there are two things involved,
1. Madara gave Izuna his eyes
2. Izuna forefully took them to prevent his own blindness..
Remember, both he and Madara had MS so they were basically on the same level.
Either way, Izuna got Madara's eyes and obtained EMS... This part is unbelieving but look at this
"When someone creates a Jutsu, he first tests it out: In this case a jutsu that would completely envelope every one's mind in Genjutsu.... Moon's eye Plan... So Izuna, with his new found EMS cast the Genjutsu, cloaking himself as Madara. Seeing that this worked, he went ahead to plan to use it on the entire world, with the Juubi's chakra ofcourse.
Last point... When Kabuto opened the sixth coffin the Person shocked Tobi(Izuna) The person was definately, Madara's real body... Madara won't be afraid if it was his Younger brothe, but the case won't be the same in reverse..
Bottom line, Tobi is actually Izuna!
It's a little rough, post your comments and such,