That's not relevant here. Sasuke needs Rikudou Senjutsu to cast Chibaku Tensei. If he doesn't have it, how did he use Chibaku Tensei ?Are you dumb? Naruto and sasuke used it together.
RSM doesn't contain yin, gudodama is a technique that does. The rinnegan is a byproduct of Yin whilst RSM is yang, the techniques granted by the abilities can be yin/yang based.
Just because the lighting is black doesn't mean its senjutsu, by your logic every cloud nin that utilize black lighting has Rikudou Chakra.![]()