Board Thread:Naruto Discussions/@comment-29393962-20161111215453/@comment-25122992-20170112112925

Well, if not the databook that clearly states these powers were granted by Hagoromo directly, I would think that technically Hagoromo just gave his chakra and seals to Naruto/Sasuke, and this chakra was the catalyst for the powers' awakening, but only the catalyst.