Board Thread:Theories and Speculation/@comment-26107879-20180520052942/@comment-30323490-20180520155320

Hagoromo had six paths senjutsu before becoming the TTJ. So did Hamura. I`m assuming that because they had their special chakra or better yet because they were born after Kaguya ate the devine fruit and because they trained in senjutsu at mount myoboku and grasped the power of nature energy, it resulted in them having six paths senjutsu.