Board Thread:Theories and Speculation/@comment-26833122-20150729101105/@comment-734582-20150801105521

Actionmanrandell wrote: Thekillman it never once said she has Everyone's powers EVER if that was the case she would be completely unstoppable whether she has everyone techniques or not Once more, she doesn't have everyone's powers. she has all powers. The elemental Kekkei Genkai are just combinations of the base elements. As Yamato put, there's no wood element. With the 5 base elements and Yin and Yang, she has all the powers. Combine this with the Rinne Sharingan and the Byakugan and she has technically all the powers. Rinnegan is something that has unique techniques, but the basic power over life and death (the Rinne part) is part of Kaguya's power.

Eventually that power of her diluted through the generations, and different people found different ways to use and abuse that power, creating new techniques and new kekkei genkai. But the source is the same. The Truthseeking Ball is the peak ability of Elemental kekkei genkai.

I also want to point out that Kaguya was a princess, not a warrior. unlike Hagoromo and Hamura who could practice their techniques on eachother, Kaguya had no equal and no need to develop techniques other than "throw a crapton of power at it".