Board Thread:Theories and Speculation/@comment-6769189-20150307180344/@comment-4271790-20150309001913

The purpose of the Six Paths Yin and Yang Powers were to seal Kaguya. They didn't enhance Naruto or Sasuke in any way, apparently. It looked like Naruto used the SP Yang power to heal Kakashi, Guy and Obito, but the 4th DB said that was YYR. It looked like Sasuke's SP Yin Power made the Chidori black, but it was in fact the SP Power instead, and Kakashi also used the SP Power to make his Raikiri black as well, and he never had the SP Yin Power. Due to what was stated, the SP Yin and Yang Powers didn't really do anything to enhance or aid Naruto and Sasuke aside from sealing Kaguya.