Simple truths about Uchiha Madara and the mystery of Tobi
Well, if you haven't seen 559 yet, go see it, it is epic. Assuming the information about Edo Tensei on Naruto wiki is correct, we can infer that some things are correct -
1. Uchiha Madara's eyes were taken after death because he still has his sharingan, so regardless of who it was, someone was there, and someone took them, probably recently after.
2. Someone is wearing the EMS of the combined MS's of Izuna and Madara. Therefore, whoever took them had to have been older, because it isn't like Edo Tensei, the eyes do not stay perfect for years.
3. Someone, most likely Hashirama, really did beat a powerful EMS user, so props to him.
4. Tobi was either watching the battle, or somehow figured out what happened because he gave explicit details about how he "died".
5. Madara is not Tobi, though that one is a bit obvious.
Here is my opinion now who is Tobi. Izuna, though at this point, Kishi is leading us in circles, and we are the confused and dizzy puppets. So who really knows, only kishi. But the reason why I believe it is Izuna, is mainly 1,2, and 4 of my above points. The shadow of his former self thing makes a bit of sense now, I think. Madara and Izuna looked like twins, nearly identical until he fought Hashirama. He knew everything about Madara, he knew the techniques of Madara, he had the eyes of Madara, he probably fought like Madara. But yet he isn't Madara. So this also brings up the question, who controlled the fox, couldn't have been Madara.
This is my theory as to the fox being controlled. Back in the beginning of shippuden, Sasuke "met" with the Kyuubi, and he said "Not at all unlike what I saw in Uchiha Madara". This is a hazy area, but I am guessing since Tobi was masked, he only saw his eyes, but seeing as how all sharingan 3 tomoe and lower look the same, it could only have been an MS or EMS he recognized?
So that kind of defeats the idea of it being Kagami Uchiha, though this paragraph is more guesswork. Simply because how would he have an EMS from way back then?
Last point lol, as to Obito and Zetsu being Tobi, It isn't Obito, but Zetsu does still seem like a possibility, because he is very good at hiding, it is just very confusing as we don't have a set timeline of how things happened.
Enjoy my
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Madara's Mask -
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This is just something I realized, why couldn't Danzo and Kagami have plotted together with Tobi, it has been shown that at some point that they met up, so Danzo probably plotted with another elder to give the spot to Madara, as he though he would become the next hokage. Just because he was gone, maybe he went to meet Madara to give him the information, while Danzo stayed behind to show he was worthy of being hokage with his strength xd