Board Thread:Naruto Gaiden/@comment-4271790-20150520184250/@comment-945885-20150521203143

GerizzyYMcrew wrote: this is interesting...from the shikamaru hidan novel: "The Nine Tails was still living inside Naruto. There were also remnants of the other 8 bijuu inside him as well. In that way, you could say he was a human pillar for the power of the Ten Tails. In the last war, Obito had become a human pillar for the Ten Tails and gained chakra rivalling that of the Sage of the Six Paths. Naruto, who’d taken the bijuu into him as well, had some of the Sage’s power even now." Note: "human pillar for the power of" = "Jinchuriki of"

Combined with the 4th databook, it pretty much confirms my suspicions. The databook says that the Six Paths Ten Tails Coffin Seal awakens the same power that the Sage of Six Paths has, and so does Naruto's Six Paths Sage Mode. The book confirms that it's because Naruto was effectively Ten Tails' Jinchuriki, and that since he only has a fragment of the other eight biju, he now only has a fraction of the power of the Sage of Six Paths.

I suspect that, in a time of need, he could reassimilate their power and activate Six Paths Sage Mode again.