it is possible that the juubi eye is the tru rinnegan and the final stage even the back of the sages cloak represents the rinnegan and the 9 tomes so there is def sumthing going on their forsure as to what no one can say
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i have a theory that each tome represents a jutsu cuz the sharingan had 3 tomes wich formed into the mangekyo wich has 3 jutsu amaterasu , tykomi, susanoo and the rinnegan has 6 paths all can be considered a different jutsu totaling 9 but its jus an idea im kicking around theres still alota holes in it one being the rinne rebirth and the seventh jutsu of the rinnegan haha
but ya there is def sumthing about the juubi eye to be revealed b4 the end