I thought that was because Madara ate, regurgitated and embeeded flesh from Hashirama on his chestKabuto can edit the edo tensei. That's why Madara can use the same Mokuton as Hashirama.
6 edo jins had fodder eyes came back with 1 sharingan and rimmegam.
with kabuto and prep time everything is possible
They didn't come back with that, Obito gave them the Sharingan's and projected his Rinnegan like Nagato did with his paths. |