Its really confusing .How come Madara was returned younger when he died at a really old age,while Hiruzen and Nagato(who was finding it hard to even walk despite being an edo tensei) were revived in their old and emaciated state respectively..Also,when the previous jinchuriki of Eight tails was revived he didn't posses the eight tails chakra (since it had been removed from him ,.causing his death).Its all really messed up ..the wiki states that the revived retains any permanent damage (i'm pretty sure missing eyes would count in that ) suffered during the person's lifetime.Ithink it was a result of Kabuto's experiments ,it says so in the wiki.
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