Board Thread:Naruto Discussions/@comment-24133861-20140702001841/@comment-5941409-20140702030958

Madara lost control of the Bijuu without him knowing since their presence is now inside of Naruto thanks to Hagoromo, for they were drawn to him after all chakra pieces were giving to Naruto. Now as for the other half of Kurama, not quite sure.

In any case the Bijuu are still inside Madara/Kaguya, sealing her away will more likely split them back up as what happened when Hagoromo and Hamura faced the Juubi, splitting it up.