Naruto does not have Bijuus inside him except Kurama. He has only chakra of other Bijuus.
naruto has half of the chakra of about 8 bijuu's, meaning he can also go hermit mode like obito somehow.
how would madara even know about that....... That would be some Aizen shit right there.
A couple of chapters ago (I believe the one where the Rinnegan silhouette appeared) Madara said something about the Juubi being interested in Naruto because it senses the other Bijuu. So he knows.
What if Madara's Wildcard is Naruto? (or better said... the Bijuus inside Naruto?)
If this is true, Madara's next objective is being a second Juubi's Jinchuuriki, isn't it?
Let the discussion begin...