I am now literally confused. All that was left of Sasori was his heart, but after resurrection, his whole body was visible. Kakuzu was revived alongwith his five hearts. Then, can I ask why Nagato's hair is WHITE and not RED ?

Nagato with Red Hair was depicted like this. I hope someone can clear this doubt...

Thanks..

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Regards,
krishna.kumar

I thought Kakuzu collected those hearts as he killed JSA shinobi?

Don't know about Sasori, and don't know why Nagato's hair is white.

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Run... Run, and cling to life.

That is a very good question, all I can think of is this. So far it has seemed that Edo tensei resurrects the version of yourself right before you die. In Sasori's case however, it may be that he "technically" died when he turned himself into a human puppet? But in the case of Nagato the losing of his hair color wasn't what killed him, it was the loss of life energy and chakra. So when he came back he still had lost his hair color despite that it should have been red. Sorry if that isn't the best answer, but it's all I can think of.

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That makes sense. That's kinda what I was thinking about Nagato too, but it sounded better when you said it, lol.

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Run... Run, and cling to life.