Board Thread:Naruto Discussions/@comment-36006024-20180926134241/@comment-30323490-20181003143408

It doesn’t work like that.SP chakra is obtained once you get six paths senjutsu.When Madara became alive during the 4th war he technically had SP chakra since he had both his (Indra) and Hashirama’s (Asura) cells. Hence he reproduced Hagoromo’s chakra - SP chakra. He also had Hashirama’s SM. So he had both SP chakra and SM, but he obviously didn’t have Six paths Senjutsu. So SP chakra + SM doesn’t give you SPS.

Hagoromo and Hamura were the only ones who didn’t have Six Pahs Senjutsu directly from bijuu chakra like Naruto, Madara and Obito. With that being said, Hagoromo and Hamura were born of Kaguya, who ate the God Fruit from the God tree (The ten-tails / bijuu chakra). So most likely their Six paths senjutsu was still influeced by bijuu chakra (from Kaguya/God fruit).

Chakra from the bijuu/tentails/GodTree is required for Six paths Senjutsu.