If i can guess correctly, and what i have seen so far in Kishimoto's style, i think that BZ will betray Madara.
I think he somehow made a pact with Obito (i know that BZ is Madara's will, but even so, he's a being in his own now, or something like that).
In the end, while Madara is highly wounded by Naruto and Sasuke, BZ will take over his body (like he did with Obito) and use Gedō: Rinne Tensei no Jutsu.
Also, I think that one of the main characters will die during this battle : Could be Naruto, Sakura, Sasuke (or Kakashi, but i wouldn't consider him a main character), and then later be revived by Madara's Gedō: Rinne Tensei no Jutsu .
What do you think ?
I think he somehow made a pact with Obito (i know that BZ is Madara's will, but even so, he's a being in his own now, or something like that).
In the end, while Madara is highly wounded by Naruto and Sasuke, BZ will take over his body (like he did with Obito) and use Gedō: Rinne Tensei no Jutsu.
Also, I think that one of the main characters will die during this battle : Could be Naruto, Sakura, Sasuke (or Kakashi, but i wouldn't consider him a main character), and then later be revived by Madara's Gedō: Rinne Tensei no Jutsu .
What do you think ?