hey guys this my first post.
I like to share this theory with guys and see what you thing of it.
first of all we all know the sharingan is a power gotten from hatred.
and the senju will of fire is a power of love(the will to protect).
I think the secrete of rinnrgan lies in the balance btw hatred and love.
consider this the sage of the six path had two sons, first son has the sage eye(sharingan/hatred) and the second son the sage body which is most likely the senju strong body.
I think both uchiha and senju can unluck rinnegan independent on the other. since they of the same origin (sage of the six path) but of opposite side(hatred and love) it makes it difficult to attain the rinnegan. Mind kishi has use this logic in the rasenshurikan and sage mode.
when naruto was learning the rasenshurikan he said it was like look left and right at the same time (opposite sides) and to taking sage mode (which requires concentration) while ruing follows the same procedure. It the secrete of the rinnegan is the same. I mean you can't be filled with love and hate at the same time so find the balance btw this to powers is the way to unlocking rinnegan.
madara could not find this answer so he took hashiramas cell which has the power of the sage body to the highest + his sage eye which is at the highest to unlock the rinnegan.
this is the reason why naruto will unlock rinnegan. He found a way of doing opposite thing at the same time using shadow clones
following this theory I thing it leads to hashirams death. mabe he know this secrete but on the process of find this balance he lost his life mabe because the risk was to much(i.e a do-or-die situation).
pls i want to see your view on this theory.