Just thought about this today:
Its not about having an uchiha or senju bloodline in one body its about whether or not you have Asura or Indara in you in order to have the Rinnegan. This supersedes the reset requirement for Rinnegan that is used in RP. Additionally, the incarnations of those two are completely random, however each spirit/will will appear in the same generation. All the players claiming an eternal kaleidoscope copy wheel eyes or Rinnegan cant actually have the Rinnegan without being a direct incarnation of Sage of the six path's sons!
"...Only by transplanting the eyes of another Uchiha can the user regain their sight and ocular powers. By transplanting the Mangekyō Sharingan of an Uchiha with strong blood ties to the recipient — ideally a sibling — an Eternal Mangekyō Sharingan (永遠の万華鏡写輪眼, Eien no Mangekyō Sharingan) can be created.[7] This process takes several days for a complete recovery,[8][9] and not only permanently restores the recipient's eyesight, but also bolsters their own ocular power with that of the donor's, signified by the intertwined appearance of their Mangekyō Sharingan's tomoe seals. Due to the compatibility issues and the Mangekyō Sharingan's rarity, not everyone can gain these benefits by transplanting the eyes of just any Uchiha, which has been the cause of many fruitless sacrifices throughout the Uchiha clan's history. Thus far, only Madara and Sasuke are known to have been successful in this endeavour.
Madara and Sasuke were able to evolve their Eternal Mangekyō Sharingan into the Rinnegan[10] Madara did so after implanting the DNA of Hashirama Senju into himself, though the dōjutsu only awakened years after the implant, when Madara's natural lifespan was almost over. Sasuke awakened his once Hagoromo gave him half of his power.[11]"
When Hagoromo gave half his power to Sasuke it filled his Senju void or Ibdara void thus he could become filly realized and awaken the Rinnegan himself. Remember obito was given the Rinnegan directly from Madara/Indara, he didn't have to work up to it.
Out of all the players that claim to have an eternal eye none of them would realistically be successful according to the manga. Additionally, none of those players would have a Rinnegan either because of similar manga evidence. No one started with the Rinnegan except for Kaguya Otsutsuki. Then Hagoromo received it and passed his bloodline traits to Indara and Asura in two distinct forms. The Sharingan and Senju.
Now that these new chapters are out claiming the Eternal Kaleidoscope copy wheel eye and Rinnegan should be void! Unless an eatablished bloodline is created regarding the Rinnegan i don't think it should still be available for IC or OOC RP. First of all its too common for its rarity in the manga/anime. And secondly, the moderators are the only ones that can be trusted with such a powerful element of sl.
If done responsibly this will encourage balanced rp!