Manga says that the Sage was the progenitor of the shinobi world.
Originally Posted by Vengeance
Actually the Juubi is the progenitor of the shinobi world not Rikkudo.
He was the one that taught the ability to mold chakra. Before sealing the Juubi into himself, he had to have the ability to use chakra to make the seal. The Juubi may be the source of chakra, but the Sage is the source of shinobi.