Board Thread:Wiki Discussions/@comment-1512913-20140521221412/@comment-1512913-20140522094257

It doesn't say her third eye was a Sharingan and it won't even if you start begging me on knees, since it said she possessed power of Sharingan besides the Byakugan with a sentence after explaining that she used the two to cast Infinite Tsukuyomi.

Hagoromo was never stated or hinted to have had the Sharingan, but he most likely did, something you yourself have advocated.

Nowhere in the manga it says: "Kaguya's forehead eye is a Sharingan" Presence of Sharingan doesn't mean absence of Rinnegan.