Board Thread:Theories and Speculation/@comment-28323245-20170127032812/@comment-734582-20170210123745

I don't fully understand what you're saying. The sharingan is a minor version of a mangekyou. You can't awaken one without the other. A good comparison is a jinchuriki: they can go straight from base to full Biju mode, but that also means they can use version 1 and 2 cloaks, even if they didn't have to actually awaken them first. It's the same power, but on a small scale.

Similarly, the mangekyou is a more advanced sharingan, and having a mangekyou means you can revert to Sharingan, it's the same eye. I don't see why Kaguya couldn't revert her Rinne Sharingan to any of it's inferior eyes like a Rinnegan, Sharingan or mangekyou. She has absolutely no reason to do that, but i don't see why she wouldn't be able to do that.