I know this had been beaten to death but what is Danzou and Madara are brothers and Madara knows he can not defeat Danzou but he is hoping that Sasuke can? After the long battle Madara sweeps in to kill off a weakened Sasuke?
The only thing that would go against this theory is that Sasuke stated he was always under Madara but he was also under Danzou to kill off the Uchihas. There is so much backstory on Danzou that hasn't been explained. We have not seen him in one fight so we really have no idea of what he is possible of.
Just throwing something out there because I am bored and hungry. Waiting for fooooooooood
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