Board Thread:Theories and Speculation/@comment-26107879-20160222005417/@comment-734582-20160227210523

Georgio722 wrote: So, the power over Life/Death right? I get your point, but that's not really what i meant. Rinnegan's powers are specifically aimed at Death. Ashura is pretty much the only one that doesn't truly fit (and seems more of a generic power shared even by Tenseigan and SPSM).

Notably: Ashura represents both defiance of death (Self-augmentation Sasori-style and simply weapons). Human is the power over the soul (something Kaguya didn't demonstrate, but Hagoromo did by bringing back the Kage) Animal represents power over likely-extinct creatures (once put under contract by Hagoromo, likely) Preta represents the Hungry Ghost realm (and so the whole chakra/jutsu absorbtion) Naraka gains access to the afterlife and complete physical regeneration.

Rinne Sharingan offers travel between dimensions (and so can travel back from death) but has no specific death theme nor the other rinnegan powers (like self-augmentation, Jutsu absorbtion or power over the soul). It grants power over one's own death in the same way Obito cheated death, but clearly Kamui doesn't grant power over death.

I can understand that it may sound like a technicality, but it's more that for Kaguya, a general-purpose jutsu can also be used to cheat death, rather than all jutsu being death-related and themed.