I think Sasuke and Oro wont show up, however, I think they will make Madara dissapear somehow - for instance by summoning him to where they are. This would make a HUGE difference for the allied force/Naruto/Kages so they could focus only on the Jubi.. Obito will somehow agree to let them try, so he will stay in the shadows, and Kakashi will probably keep an eye on him. Naruto will get a powerup, and this will be fine for kishi and the story, since those tailed beasts gave him some of their chakra. We already got this hint by seeing how much chakra the kuybi could give kakashi in an instant. So without Madara at this battle scene, we will see Sasuke vs Madara and allied force (naruto power up) vs jubi.. This also allows kishi to end out with the faited naruto vs sasuke