That is true

, But considering that Juubi is God, The Progenitor of Shinobi World Begining of chakra as well as that Juubi's giant eye resembles Rinnegan and Sharingan it can be possibility
Then I believe that Juubi's eye is origin of all sharingan and rinnengan powers(this last is only correct if you believe SOSP obtained Rinnegan after becoming Juubi's Jinchurki

)
Anyway Obito by becoming Juubi Jinchurki simply got his hands on all sharingan powers/moves

, Amaterasu as well

. Why didn't Juubi use these powers before since ressurection because his power was randomely used but now can be used as focused power which give Juubi Jinchurki a lot of new powers...
I hope you get my point

Anyway thanks you very much for honest feedback