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### This question contains spoilers for anime viewers and early manga viewers.

> When Nagato was revived with Edo Tensei, he had Madara's eyes. When Madara
> was revived, he had his original eyes too (Rinnegan, much like Nagato).

Is this exploitable? Can I repeat this cycle of transplant and revive to
duplicate strong eyes? How does that work really?


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naruto
Is it possible to duplicate eyes?


I've found some information on
[this](http://naruto.wikia.com/wiki/Madara_Uchiha) site why Madara got his
eyes and his young body.

> Due to the manner of his revival and the experiments done by Kabuto, Madara
> retained access to abilities he obtained late in life (like his Wood Release
> and Rinnegan), while at the same time retaining the youthful body of his
> prime.

So he hasn't been revived "normally"

Since Nagato never lost his eyes he's revived with them too. So Madara
actually did duplicate his eyes with the help of Kabuto. Since we don't know
what would have happened if he would have been revived "normally" (at least
not yet) we can't say whether it is that easy to duplicate the eyes or it was
a coincidence that the eyes are now duplicated.

Long answer short: It is possible to duplicate the eyes.


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Although never explicitly stated (till now), it seems Kabuto's upgraded Edo
Tensei allows him to revive a shinobi with a mix of attributes from different
portions of their lifetime. Shortly after showing the last coffin to Tobi,
Kabuto exclaims that he had surpassed the Second Hokage and Orochimaru. It is
very likely this is what he was referring to.

It is possible to have multiple copies, and this has already been exploited
with Itachi's Sharingan and Madara's Rinnegan.

Both Itachi and Sasuke had Itachi's Sharingan at the same time. The revived
Nagato **and Tobi** both have Madara's Rinnegan. If Itachi had not sealed
Nagato, there would indeed be _three_ copies of Madara's Rinnegan active at
the same time.

The Madara's Rinnegan case shows how it could be exploited multiple times. If
Obito dies and is revived, while his Rinnegan is transplanted to someone else,
you could then have _four_ Rinnegan, which are all really Madara's Rinnegan.


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As far as I understand it, let's say you reanimated Itachi. Sasuke, for
arguments sake, doesn't have an eternal mangekyou, so he needs to switch eyes
with someone. If he switched with Itachi, Sasuke would have good eyes, and
Itachi, the worse ones.

I'm almost certain you can't reanimate a person twice at the same time,
otherwise we'd have seen a lot more Kages in the fourth shinobi war. This
means because you can only revive someone once at a time, and upon
death/revival the reanimated body's eyes flake off and diminish, only four of
a certain set of eyes can exist at a time because the eyes destroy themselves
when the reanimation is destroyed.

This means, at a time, you can only have 4 eyes in existence (Two in the
reanimation, and two in the reanimated persons original body in a coffin, if
they haven't rotted away already) .


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