Don't forget, as I said in a previous post, it was impossible for Madara to use Izangi during this fight. You have to have both Uchiha and Senju powers to use it. He fought that fight to gain the first's DNA, which means he had no Senju powers at the time....this fight also allowed him to create Zetsu. Did you guys read my post on the bottom of page 11? Heres the chapter.....and btw, Tobi did have a second sharingan that whole time wearing the one-eye mask, he uses it here for Izangi.about eye I think Madara in battle with 1st he use Izanagi.. If you use Izanagi you lose one eye..
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