Board Thread:Naruto Discussions/@comment-24373005-20141013001519/@comment-25294339-20141013015037

I'm quite sure Hagoromo gifted the two with just the Yin-Yang. As Seelantau stated, other potential and much more plausible sources of power were available at the time (Hashirama's DNA/chakra, other small portions of Shukaku and Gyuuki). The hands symbols were what was almost certainly bestowed upon them.

The Yin and Yang powers were unfortunately consumed for the Yin-Yang seal thingy, for Kaguya. Though they lost those powers, Sasuke and Naruto still retain their already immense spiritual energy and vitality, respectively.