In the latest chapter,kyuubi seems supporting Naruto to fight.Whether the kyubi really want to help Naruto or he just want Naruto to use up all his chakra,i can't think it clearly.So,from your point of view,did kyuubi will cooperate with Naruto to defeat Madara?Lets just talk about it,we share our opinion...
If we based on the latest chapter then it clearly
shows that kyuubi really does cooperate with
Naruto if the enemy is Madara. Anyone would rather
be contained by an annoying host than being used
like a puppet. The kyuubi is completely controlled
by Madara when it is summoned thus making the
kyuubi do everything against it will.
I think the kyuubi was backing Naruto because he
knows he can't even face Madara without out
him being taken control of. So he really is
depending on Naruto to defeat Madara and I think
he will gain enough respect for Naruto that he
will help him grow to a higher level as a ninja by
the time he face his greatest challenge Sasuke.
As i know from the manga,only Sasuke and Bee(since
he is Hachibi host)can see Kyuubi inside
Naruto.So,i think,that's why Tobi protecting
Sasuke so much,Tobi want Sasuke to take control of
Kyuubi.As a result,Kyuubi will be cooperate with
Naruto to fight all the Sharingan users except