Board Thread:Theories and Speculation/@comment-1512913-20161125200227/@comment-734582-20161129171135

In case it's the first option and she didn't have it, then it's possible that there might be some special condition required to awaken the Tenseigan, just like there is a condition for Mangekyou Sharingan. A bit of column A, a bit of column B.

I think Kaguya possesses most of the power of Rinnegan and most of the power of Tenseigan that having either eye doesn't really matter. I think Rinnegan and Tenseigan are mutations that strengthen the connections with pre-existing powers, specifically:


 * rinnegan connects with Six Paths chakra, granting greater control over life and death.
 * Tenseigan connects with Sage Chakra, granting greater control over nature energy.

Kaguya possessed those powers (she had six paths chakra, rinne Sharingan, Byakugan and Six Paths Senjutsu), but in Hagoromo and Hamura those powers specialized as Dojutsu.