lucky3able
Member
I think that hagoromo had a sharingan but later killed his bro and collected his powers and got a rinnegan,then gave birth to two sons.one having the sun chakra of his brother and the other having his moon chalra but he new that the moon chakra was greedy and enthrusted it to the sun but also knew that the moon will once again reunite both chakras to obtain the rinnegan once again just like hagoromo himself did to his brother.I think this better explains why naruto is still a sun while being a moon aswell