I didn't say he wasnt. The point I am trying to make is Naruto HASN'T used his Yin power beside's healing Gai and Kakashi's eye. He used the other bijuu's power for the other elements. This shroud is no different. Naruto doesn't have just Yin Chakra, it makes no sense. The Rikudou Senjutsu would be considered the Yin of the Sennin's powers, but Naruto could use the enlarge cloak arms BEFORE Rikudou Senjutsu. We are getting off topic though, I'm gonna stop.Again , Ashura is YANG.
The manga says that Hashirama and Madara were transmigrants of the previous generation , that's a bit different and a lot more vague and ambiguous.