Board Thread:Naruto Discussions/@comment-3279282-20140820130933/@comment-23887466-20140820170631

Well, When Sasuke used the Black Chidori, he said that he gonna use the Six Paths' Chakra. Kakashi called it Six Paths' Power and he was able to create a Black Raikiri. Since both of them worked against Kaguya and the Ten-Tails' Jinchuuriki, that mean its also Senjutsu, but not Rikudou Senjutsu.

Remember, Hagoromo's power was always two parts, the first is the eyes (Rinnegan) and the second part is the body (Rikudou Senjutsu). Other than the eyes, Sasuke gained a portion of Chakra, which he named Rikudou Chakra, its the same for Kakashi.