Sage was a mixture of Uchiha/Senju in one body. Pay attention to the manga, plus he had the Rinnegan. No one has ever seen Rikudo face so show me the marking on his face. Almost everyone in the manga has a tomoe's Naruto, Sasuke, Orochimaru earrings no one said that design was exclusive to the Sage when other people have them. I never seem Kurama mistake Naruto for Rikudo.
