The Rinnegan is the next evolutionary stage, Rinnegan>EMS>MS>3T. If the Sharingan having certain jutsu per eye didn't change as it got stronger then why would it when it evolves to the Rinnegan? You can use the full power of that Rinnegan with the jutsus it hold without being capable of using all of its jutsus. Also clearly Kishi didn't have Madara follow through since he didn't use Rinnegan jutsus such as Deva, absorbing, or weapon path. Also it was Madara and Obito who said more than once, the full power of the eyes is achieved when both are together.
The evolutionary stage doesn't apply to Hagormoo, the birth place of the rinnegan.
Madara said with one eye he can use full power, before knocking over the bijuus.
Where did Itachi come from? Madara told Obito that having both eyes is stronge, back when they first met. Then Obito says it against when he and Kakashi teamed up to try and get Obito to Naruto in Kamui dimension. Obito was using Kamui snipe to Kamui through Kaguya dimension and he did use it to Kamui the ash bone that was going to hit Kakashi. That eye was going blind as Kakashi stated against Madara. You mean Obito Kamui sniping the bone then choosing not to go intangible so Naruto who was behind him doesn't die?
Madara was talking about the sharingan, he said the sharingan reaches full power when they are met.
That's why kid Obito said he wanted to team up with Kakashi.
When Obito repeated when he was older, Madara said: "No, that's a rinnegan."
I said it was either plot or Madara wasn't able to use that ability with the Rinnegan he has, why are you making it sound like I said Madara not using it is strictly plot? Fact is that he was in a good possession the use it but didn't, even after getting his other Rinnegan he didn't control them so either he couldn't with the 1 eye or plot stopped him from doing so with his 1 eye. Using the chakra blade is an ability of the Rinnegan, they can create them from their body thanks to the Rinnegan and it's something both Obito and Madara had since Obito had to have it to put them in the Jinchuurikis and we saw Madara make his own from his body to use on Hashirama.
He didn't control the bodies because that's not what the rinnegan allows you to do.
Go to the 3rd databook on Nagato and rinnegan, read the summaries that were on the chakra rods.
It doesn't confirm it as rinnegan origin (ability)
Even old Madara no rinnegan used the black rods to his leisure to give to Obito.
He told him to use it for the six path Justus, not the use of dead bodies.
That's a technique that Nagato created and named it out of his persona six path of pain.
Rikudou no Justu =/= rikudou pain or pain rikudou