Board Thread:Theories and Speculation/@comment-30787246-20161219014910/@comment-1872728-20170109224648

Ravenlot 27 wrote: Even in the anime, it's not clear if the forehead thingy is somehow connected to senjutsu. Alright, this is how I came to my conclusion:

Uchiha has the Sharingan, and Senju has the Senju Sage Mode (explanation see #3). Indra has the Sharingan, so Asura should have the Senju Sage Mode. Hagoromo has the Rinnegan, so Hagoromo should have the Six Paths Sage Mode.

Sharingan gives special eyes, and Senju Sage Mode gives special "third eye". Rinnegan gives special eyes, so Six Paths Sage Mode should give special "third eye".