Okay there is a lot of speculation on how to gain the rinnegan. i believe and support the idea that uchiha are the only ones who can unlock the rinnegan and senju cant unlock it but can hold the rinnegan in their bodies and use it to its full effectiveness.
For example we have nagato.
Nagato had a rinnegan eye implanted into his eye by Madara.
Madara chose nagato because of the sole reason of him being an uzumaki and with senju candidates being so rare he settled on nagato before he died that would explain why he was chosen. Uchiha symbolize the eyes which are able to unlock the rinnegan. and the senju symbolize the body who cant unlock the rinnegan but can use it. the puzzle fits.
uchiha need senju dna and ems to unlock rinnegan and senju need uchiha eyes to unlock rinnegan. They fit perfectly. Thats my theory.
英雄メンバー / Eiyuu Menbaa / Hero Member
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I disagree, a Senju/Uzumaki could awake the Rinnegan if he had the eyes of an Uchiha implanted into his sockets and lived up to a long age.
The problem is that the likelihood of this happening is much lower than that of an Uchiha acquiring Senju cells and awakening the Rinnegan on his eyes.
Because the eyes must be at least a Mangekyo I presume, it is extremely difficult to defeat the Uchiha needed for the transplant and you would have to give up your natural eyes for a chance at awakening the Rinnegan much later on the future.
Considering that a pair of constantly activated Sharingans draw a lot of chakra, something countered by a Senju's large reserves, and that you can never blindfold both of them while they never turn off in your life this carries an immense risk of killing you before the Rinnegan is awakened at a useful age.
The only way for someone to enjoy the Rinnegan to full potential is if that person is born from Senju/Uzumaki and Uchiha parents with the ability to awake it naturally.
Madara had to create a complex revival plan just for the sake of using that Dojutsu on a rejuvenated body because the end of life requirement makes it too impractical for personal use.
That said, there is an alternative method to awake and gain dominance over a Rinnegan despite being neither Uchiha or Senju/Uzumaki.
That method is by eating the fruit of the Shinju which is the source of the goddamn thing in the first place.
Chances are that this will be Sasuke's route to a godlike power up for the sake of surpassing Naruto again.