How Sasuke will become the 10 tails Jinchuruki and why Uzumaki Naruto is not
I'll say this: Hates gonna hate. If you don't like my theory, then don't bother reading it. Seriously, hear this out. We have a few hints of this:
First, Obito has some level of plans for Sasuke. He mentioned to Zetsu that he planned to sync him with the statue eventually but that it was too soon. Notice: Black Zetsu wasn't there heh. The black one is loyal to Madara (or was, at any rate). He lied to Kabuto.
Obito never wanted Madara to be resurrected. He won't use Rinne Tensei now, and he didn't before. He was horrified when Kabuto showed up with Madara's body. In 614, we again see Obito tell Madara off straight up: I'm not your buddy, guy. It's a Mexican standoff. Madara cannot kill Obito and Obito lacks the power to kill Madara. Sasuke's his trump card, a final way to say screw you, Madara. My money is on Obito already knows how Rin really died. Notice he said to Kakashi trash should shut up and You let Rin die. He didn't say "You killed Rin". He never wanted to kill Kakashi, or he'd have just done so back during the 5 Kage arc, where it was obvious none of the Kage could touch Obito, including Danzo. Kakashi was and is far, far weaker than Obito.
Most damning is that Sasuke's trust was earned at a high price. Madara demanded his loyalty and went to great lengths to get him on his side. Why throw him out now, just because he killed some white Zetsu? The Zetsu were always just minions, doubt Obito cares much if Sasuke off'd the white zetsus.
For his part, Sasuke has always wanted two things: Revenge, and the power for Revenge. This has not changed since Chapter 1. I predict Sasuke will become the 10 tails Jinchuruki, Obito will be killed by Madara and Madara will be sealed. Final fight is Sasuke vs. Naruto. Naruto will die to save Sasuke, and Sasuke will likely resurrect him if he does die.
It's not Kishi's style to do what we expect, guys. So scoff all you will at this, but Sasuke's always been the one furthering the plot. If we think there's no role for him in this final fight, that's being naive. Naruto cannot have two tailed beasts sealed in him, and Kurama is already there. Naruto solo'ing the Juubi is unrealistic. Shikaku's plan will buy them time, but that is about it. As for Madara, he's like the Narutoverse's Aizen. We've always known he has to die due to plot jutsu.
The scroll probably can seal the 10 tails, and Madara is the "one who knows everything". as Orochimaru knew about it and Rinnegan as well as Mokuton. For Oro's part, he wants to take Sasuke's body after the power-up, but will likely fail. Suigetsu and Jugo will be sacrificed to resurrect Sasuke's loved ones heh