STOLE Izuna's eyes! I know this is kinda old, but I haven't heard about this in a while.
Obito (posing as Madara) told Sasuke that Izuna willingly gave his eyes to Madara for the good of the Uchiha clan. After finding out that Tobi is Obito... we have learned that he has lied to every one he has worked with in order to get his way.
Itachi said that Madara stole Izuna's eyes. We used to think that Itachi was the bad guy, but we learned that he is in fact truthful and very honest about what he says.
Before we even saw Madara, we heard light stories about his past. Now that you have seen him, his personality, and his intentions... do you think that he stole the eyes or Izuna willingly gave them to Madara?
Do you also think that there will be anymore flashbacks about Madara's past and Izuna?
Also... why didn't Kabuto resurrect Izuna? Pain's rinnegan/Madara's eyes are really Inzuna's. There is the DNA. Do you think that Izuna could have had the will of fire (while still trying to be loyal to his clan). Sasuke inherited his clans hatred... Itachi has the Will of Fire. Kishi tends to make present characters similar to past characters.