i think that any1 with ems can't evolve to rinnegan.. bcause first of all.. it would be stupid.. cuz its called 'unique' eye, madara was super uchiha and he had hashi cells etc weird shit and he knew how to obtain em, and i believe to get em you must die and return to live somehow to get em.. but that would be a waste, bcuz once you're dead.. you are dead lol, without edo tensei or king of hell. madara is just special case lol.