So I was bored so I started reading about the Tenseigan and the Rinnegan, you know, as one does and I was able to notice certain parallels between them.
Hamura obtained the Byakugan from Kaguya's Otsutsuki eyes after eating the fruit. Hamura matured his Byakugan into Tenseigan.
He had children which separated his chakra into two byakugan families.
To prevent the threat of the power of the Tenseigan, he sent one of the branches of his children to earth and another stayed in the moon to prevent them coming in contact, forming the Hyuga on earth and the Otsutsuki on the moon.
If both combine their eyes (with transplant) and with extension, both parts of Hamura's chakra, the Tenseigan will be reborn.
Hagoromo obtained the Sharingan from Kaguya's Rinne Sharingan after eating the fruit
Hagoromo matured his Sharingan into Rinnegan.
He had children which separated his chakra into the Sharingan and “body” families.
To prevent the threat of the power of the Rinnegan, the two main families, the Uchiha and the Senju (and Uzumakis) were mortal enemies, with Asura's and Indra's split chakra from Hagoromo being reincarnated one in each family, both clashing with the Will of Fire and Curse of Hatred, preventing merging of their power.
If both families combine their chakra and with extension both parts of Hagoromo's chakra, the Rinnegan will be reborn.
SO I see the Rinnegan and the Tenseigan as being parallel Dōjutsu! Please do say what do you think? (Hamura is love btw <3)