Board Thread:Naruto Discussions/@comment-24531362-20140831150337/@comment-25072274-20140903193217

She's not Juubi's jinchuuriki, it was stated in Kaguya's Tears that she in fact, is the beast, after merging with the God Tree. Madara lost control of the beast after BZ infused Kaguya's will in him. But yes, she probably is an user of SPST, as she has the chakra of the Ten-Tails.