Board Thread:Theories and Speculation/@comment-734582-20150712141917/@comment-4912646-20150712221818

The Tenseigan comes across as kind of an anomaly compared to other dōjutsu. Aside from the Byakugan, which are apparently the eyes that Kaguya's species naturally possesses, all the other dōjutsu are just descendants of Kaguya's Rinnesharingan, which she acquired from the Shinju's fruit. So the Tenseigan, as an advanced Byakugan, is really the odd one out. I wish we knew what it actually takes to acquire it and why Hamura was apparently able to awaken it when Kaguya did not.