- Izuna was hidden again until Senjuu DNA merged completly with Uchiha DNA. When process was completed Akatsuki had one place free after Sasori Death, so Zetsu introduced Tobi<Izuna> in organization.
- Izuna took great interest in Sasuke Uchiha, as He was Uchiha memeber as well as younger brother which was in shadow of Itachi, his older brother. Izuna felt bad for Sasuke to be in shadow of older brother.
-Izuna even fooled Itachi because he has chakra similliar to him. He has all knowledge as Madara from Zetsu.
- Izuna as Tobi traveled with Deidara to hunt three tailed beast, sanbi. While Tobi was catched by three tailed beast, He was in ghost mode so he survived Deidara bomb.
-Tobi as Izuna survived all Deidara attacks, and he could survive even more. He behave silly to fool everyone to hide his really personality. He was great actor no doubt.
- After Diedara death He finally revealed himself as true leader before readers but took name of Uchiha Madara. However Nagato was still leader for Akatsuki memebers. Only Nagato, Konan, Itachi and Kisame<probably> knew about him being real leader.
- After Nagato death, He was busy prepearing for War while Meeting of 5 Kages was happening. After declaring fourth great war Tobi as Izuna was busy created Zetsu army from bijuu chakra.
- He wanted Sasuke to get stronger so send him on 5 kage meeting. He understands his feelings.
- He wanted Danzo to be dead becuase Danzo killed Kagami Uchiha, his teammate who was spy for Izuna, I mean Tobi.
-Thanks to Hashirama living clone Tobi as Izuna, who is perfectly compatible with Senjuu DNA so can regenerate his body or make his body younger somehow.
-He retrived Rinnengan both eyes, which was created from his<Izuna> orginally eyes ,from Nagato corpse. In Tobi vs Konan fight he used Izanagi which let him avoid death. It supports my theory that he mastered Izanagi.
-He saw Hashirama Senjuu in Naruto because as Izuna he met Hashirama for sure in battle.
- In short time He was able to use Rinnegan, probably Rinnengan paths as well because it was his eyes orginally.
- Izuna knew Madara personally so he could fool everyone beahivng as him.
- Izuna planned to get Rinnengan, master using these eyes and then ressurect his brother but Kabuto appeared before and broke his plan by ressurecting Uchiha Madara, his brother with Edo Tensei.
-Izuna wasn't afraid that Madara wanted to kill him or something. First reason he didn't want to fight him, second reason was he was afraid Kabuto will control Madara and force him to fight Tobi as Izuna.
- While telling Sasuke about everything he gripped his clothes when he mentioned about Izuna<himself> giving willingly brother eyes and die after.
He wasn't mad for Madara but he was sentimantal about his death and past.
- When He met Naruto and Killer bee, he told that he is nobody and don't want to anybody. He was forgotten by Ninja World, so he was nobody. He only care about Moon eye plan to be realised, because his brother Madara sacrificed many things to do it, besides Izuna himself watched corrupted Ninja World, so he decided it was only way to create peace.
-Izuna as Tobi know everything about Obito, which I explained in Kagami <obito father> as spy. He know about Kakashi regrets and personal actions thanks to Zetsu who spied Kakashi all time, maybe for Izuna to get other Obito eye as well.
- Izuna was ressurected with no eyes via Rinne Tensei, so that why he collected these sharingans.
- I think Tobi was using Obito Sharingan almost all time. Tobi as Izuna has minimal drain using sharingan. Kakashi can use kamui only when he has Mangenkyou sharingan activated, so Tobi probably use Space time Ninjutsu only when he has Mangenkyou sharingan. Izuna mastered MS so he can use efficently as Obito would never use probably. He has Senjuu DNA in himself and even perfectly merged so he can use Space time Ninjutsu as much as he can, because Senjuu cells are healling Mangenkyou sharingan bad side effects.
- Tobi as Izuna chakra amount is easy to epxlain. He has probably great amount of chakra but below Naruto own , Kisame and Nagato, but Senjuu cells accelerate procces of chakra restoring, so He looks like has infinite chakra. Besides mastery of sharingan and great mastery over Senjuu and Uchiha techniques, DNA let him for minimal chakra using.
Summary: I know that this is great wall of text and in random order, and wrong thread probably, but please don't remove my post. I hate Obito being Tobi idea, there is so much plot holes, inaccuracies that it isn't even funny. Please Kishi make him Izuna, I hope I covered all plot holes, facts with Tobi being Izuna.
If this is wrong thread for discussion just please move this post.
If you want to know even more please read my prediction with number 600. I hope I convinced you people and Kishi himself<lol> to Tobi being Izuna.
If you have any questions or doubts, just please wirite about them and I try to explain them.
Tob being Izuna would be epic. If you agree with all my theory and facts just please thanks this post or write about it. Sorry for my english or any grammar mistakes