Personally I think that this Naruto, Bee, Kakashi & Guy vs Tobi fight is only a part 1. Somebody will die in that fight (Bee, Guy, Kakashi) then I think the main army will arive or something will happen which will force Tobi to flee with the imcomplete ten tails. Sasuke could not beat Edo Madara. A few of the Kages will die against Madara. Then Madara will leave to meet up with Tobi. This would give all charcters time to regain strength, Sasuke time to go on a magial quest with Michel Jackson and time for Tobi and Madara to have a talk.
After all that there will be a show down with Naruto vs Sasuke ether before or after the final Tobi and/or Madara vs World fight.