Crazy scenario for Naruto's ending
What if while Naruto is unconscious, he gets more Kyuubi chakra, enough to save him, but while it stops him from dying, it won't yet make him conscious.
So, while everyone is holding off Madara until Naruto wakes up, Madara kills everybody.
Then, Naruto will regain his consciousness, leaving only him and Madara in the world.
Then, Naruto could talk no jutsu Madara into believing him that the world will move towards peace with the Shinobi alliance and the Bijuu, then Madara explains why he can do it better. Giving all the details of his plan before launching it.
But, Madara wants them to agree on one answer.
So, Madara gives Naruto a choice, to decide which is way is better, his Infinite Tsukuyomi or the Shinobi alliance, but if Naruto picks the Shinobi alliance, it would cost him his life ( Naruto's life) in exchange for everybody in the alliance being revived, and Madara re-creating the Bijuu before using Rinne Tesnei on the alliance.
NOTE: There is absolutely no evidence to support this, so I do not consider it a theory, it was just a scenario I played out in my head while randomly making them up.
TALK NO JUTSU= MOST POWERFUL JUTSU