tobi and kakashi

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What is KAKASI?

I think Tobi is Kakashi. Tobi wears a mask which covers his face like Kakashi. They can do a very similar time-space jutsu. When Tobi fought Konan, half of his mask broke but they didnt show his mouth, just like kakashi. So my theory is that Kakashi already lived before and somehow mastered his mangekyou and create a time-travel jutsu which can be used only once. He came back and controled 4th mizukage thats why Kisame said ur Madara when he saw him. He wanted to seal the Kyuubi inside Naruto. cuz in his days Naruto was just a useless shinobi whose dad is still a hokage so this way he can get rid of Minato and he can make sure Kyuubi is safe with Naruto. And when the day comes without Minato on his side he can easily take the Kyuubi from Naruto. This is just a theory of course but I think its a good one .