Why is it that Madara came back as edo with his original eyes, the ones he gave away but Nagato came back with the eyes he got from Madara?
Is there a rule that im missing or is Kishi makin stuff up on the spot.
It's not his original. All reanimation does is create a copy of your previous body before death and seals your soul within it.
Everything thing about your body and powers with it is a copy.
Proof would be Sasuke taking Itachi's eyes, and yet itachi still having the same mangekyou as his original.
So don't worry to much about it.
Also to explain Madara's situation. Orochimaru and Kabuto's research help modify Madara's body allowing him the use of a copy rinnegan and sharingan. Not the original