Board Thread:Theories and Speculation/@comment-34661853-20181111160651/@comment-1512913-20181115150005

For all we know Hagoromo had the Sharingan as well, I know the filler doesn't count, but I mean in canon. Not show or stated =/= false, it's still possibly true.

Also no, there is no evidence you need to have the Sharingan in order to awaken the Rinnegan. That's simply the way Kaguya's powers split in her descendants.

Momoshiki supports there having been an earlier Otsutsuki than Kaguya possibly with Rinne Sharingan.