Board Thread:Naruto 7: Discussion/@comment-24516546-20141107133049/@comment-4271790-20141128215704

Shak, according to ItachiWasAHero, he read somewhere that Toneri took Naruto's Six Paths chakra, and that forced Naruto to finally use the full Yin-Yang power of Kurama, at the cost of no TSB or Six Paths Sage Mode.