Board Thread:Naruto Discussions/@comment-34700383-20180829185752/@comment-34700383-20180901115232

There is no such evidence of hamura and and hagromo having rikudo senjutsu prior to sealing the juubi. The most you can show is kaguya recalling an image of hagoromo, but there’s no timestamp attached to that recalling. Furthermore as the juubi, she could’ve recalled events post being sealed inside hagoromo proven by the fact that juubi spoke to madara. Not only that but she also somehow knows the names of her grandchildren Indra and ashura. There’s in no explanation as to how she knows this, it was only provided that she does.

I proved in the OP that biju chakra was used to power rsm. I also pointed it that both hagoromo and kurama said that Naruto met many conditions, and because of this he received power. Gyuki and kurama clarifies that among those condition one of them was having chakra from all 9 biju.

This establishes the juubi chakra as a requirement since it was after this moment that hagoromo high fives Naruto granting him the rsm form to use the power he currently has. Which is more power than just kurama. The exact statement made by the databook.

Asking for the biju chakra proves he staring use them. Madara acknowledged his power was gradually increasing. Madara didn’t know if the other 7 chakra fragments inside of Naruto. Still, once he enters rsm madara clarifies that his increased power is rikudo senjutsu.

This too is found in the OP.