first things first, i believe nagato's rinnegan is natural, and that he developed them.
1. obitobi said that nagato was the "third sage of six paths" and he would know.
2. tobito has lost 3 RIGHT arms (minato, konan, torune) and we know he is part zetsu. he is an uchiha, so with hashi cells from the zetsu that madara made, he can use izanagi and handle the rinnegan. nagato never had any hashi cells, nor uchiha parts. he awakened the rinnegan naturally.
hopefully we learn more in the coming chapters, and kishi can do whatever the hell he wants, but i think my theory is logical.
1. obitobi said that nagato was the "third sage of six paths" and he would know.
2. tobito has lost 3 RIGHT arms (minato, konan, torune) and we know he is part zetsu. he is an uchiha, so with hashi cells from the zetsu that madara made, he can use izanagi and handle the rinnegan. nagato never had any hashi cells, nor uchiha parts. he awakened the rinnegan naturally.
hopefully we learn more in the coming chapters, and kishi can do whatever the hell he wants, but i think my theory is logical.