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Here we see Madara say the rinnegan is needed to unlock the Middle eye and cast Infinite Tsukiyomi.
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Then here we see Kaguya with the mark on her head. How did she gain that Eye?. Then I had thought of something Black Zetsu was said to have changed the uchiha Tablet. And Madara said he read from the tablet the the rinnegan is needed and that could be a lie and Kaguya had another method for it. What do you think ?