Ill report what I said before:
Think about it, when obito transfered his Sharingan to Kakashi it already had the 2nd tomie unlocked. The same thing can go for the rinnegan. I mean there is litterally NO reason for Madara to give something as extremely valuable as the rinnegan to some kid in one of the deadliest villages in the fire country, does the name blood mist village ring any bells?
Except all of the power from the sharingan came from Obito, none of it came from kakashi. Using that logic, all of the power came from madara, and the only reason he gave the power to nagato is because the uzumaki are related to the senju. He DID NOT unlock any "extra" powers. The only thing Nagato had was he was a senju, or distantly related to the senju.
What if he needed an uzimaki, who are known for there strong life energy, to unlock the abilities of the rinnegan for him, that way when he took them back he could use them. He doesnt have to worry about them taking up too much chakra or stamina because as an edo tensei he has an unlimited ammount. It is also why Obito doesnt use it because since he is not under the edo tensei him using the rinnegan would do to him what MS does to kakashi but most likely even more so because the rinnegans abilities are stronger.
Which is wrong, because Madara had the rinnengan when he used the Edo tensi, and he said he "unlocked the rinnengan" after implanting shodaime's cells. It's folly to assume he had no rinnengan powers if he could control the gedo mazo, which was stated only someone with the rinnengan could do. You also can't say that because Obito doesn't use the rinnengan that proves your point. Maybe he just doesn't WANT to use the rinnengan. Again you have no proof other than your own guesswork that the rinnengan uses more chakra for obito than for pein.
Also keep in mind that the 9 tails host has always been uzimaki's, also keep in mind that Naruto's bijuu mode looks alot like the SO6P, perhaps the uzimaki are decendants of him if not hashirama.
And that means what, exactly? The nine-tails was Madara's personal summon, once. The "cape" is from the fourth hokage, which doesn't mean that he is some how the Sage of Six Paths. The sage had two sons. This has already been stated. You can't refute this. One created the uchiha, and the other created the senju. The uzumaki are an offshoot of the Senju. That is final. Everything else is your own opinion and it doesn't hold up to my facts.
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