Board Thread:Naruto Discussions/@comment-5054236-20150717003436/@comment-26369387-20151213214208

Detrain wrote: The only reason I see Madara didn't access 6 path senjutsu because he didn't merge the senjutsu chakra with his own chakra instead he channeled in it through the Hashirama face.

Expect Madara HAD Six Paths Senjutsu, by being the jinchūriki of Ten-Tails.