I have a few questions and those might explain it:
1 - Q: Edo Tensei revives someone to the state he was before dying but here we see Madara very very old.
1 - A: Madara had a plan to fight Hashirama and die taking some of his powers so he prepared some kindof splitting technique. The splitted part doesn't count as being alive but would make use of Hashirama's powers to take the remaining Rinnegan and keep Madara's plan work. The splitted part would give Nagato the Rinnegan to revive the original Madara who died young with Rinnegan just after Hashirama's fight.
2 - Q: The Sharingan and Rinnegan eye modes, how does it work?
2 - A: If an eye is implanted then it keeps in its condition of being Sharingan or Rinnegan and doesn't become normal.
If it is Sharingan it can switch within the different Sharingan modes (from Sharingan to Mangekyou Sharingan) but can't change to Rinnegan whatever. If it is a Rinnegan it can't change to Sharingan. Nagato here fits cause he didn't awake the Rinnegan but got it implanted by Madara and that's why it's always in that condition (as I remember).
If Rinnegan is awaken by the same person, then he can switch from Rinnegan to Sharingan to normal whatever way he wants. But to awake EMS first, one has to take someone else MS eyes (maybe necessarily a relative/brother... I'm not sure). So about the implantation, maybe if he is a relative or an Uchiha, then, even if the eyes are implanted he still can switch between the different modes and that's why Edo Madara was able to switch as he wished.
1 - Q: Edo Tensei revives someone to the state he was before dying but here we see Madara very very old.
1 - A: Madara had a plan to fight Hashirama and die taking some of his powers so he prepared some kindof splitting technique. The splitted part doesn't count as being alive but would make use of Hashirama's powers to take the remaining Rinnegan and keep Madara's plan work. The splitted part would give Nagato the Rinnegan to revive the original Madara who died young with Rinnegan just after Hashirama's fight.
2 - Q: The Sharingan and Rinnegan eye modes, how does it work?
2 - A: If an eye is implanted then it keeps in its condition of being Sharingan or Rinnegan and doesn't become normal.
If it is Sharingan it can switch within the different Sharingan modes (from Sharingan to Mangekyou Sharingan) but can't change to Rinnegan whatever. If it is a Rinnegan it can't change to Sharingan. Nagato here fits cause he didn't awake the Rinnegan but got it implanted by Madara and that's why it's always in that condition (as I remember).
If Rinnegan is awaken by the same person, then he can switch from Rinnegan to Sharingan to normal whatever way he wants. But to awake EMS first, one has to take someone else MS eyes (maybe necessarily a relative/brother... I'm not sure). So about the implantation, maybe if he is a relative or an Uchiha, then, even if the eyes are implanted he still can switch between the different modes and that's why Edo Madara was able to switch as he wished.
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