Re: Sasuke won't die.
An analysis of Mangekyou Sharingan and its relation to the Nine-Tails:
Predicate 1: Some of the Uchiha are pathological liars or sociopaths, thus only the actions can be 100% true
Predicate 2: Strength comparisons between characters are based on upgraded power, training, intelligence and tactical situations (current battles)
Predicate 3: The past is a good indicator of the future
Predicate 4: Merchandising information can be trusted for purposes of arbitrary versus threads
Let's consider the manga evidence...
Evidence A: Obito extracted an unwilling Kurama through use of his Mangekyou
Evidence B: 3-tomoe Sasuke surpressed half-strength Kurama
Evidence C: Uchiha Madara used EMS Sharingan to control Kurama and place him under genjutsu
Evidence D: Kurama is able to be genjutsu'd by those with M.S. or E.M.S.
Conclusion 1: Sasuke can control the Nine-Tails chakra at least as well as Madara, meaning he can extract Kurama and place him under genjutsu once the Yang chakra returns to Kurama
Conclusion 2: Sasuke can possibly cancel KCM and BM entirely, or turn Kurama against Naruto by using Tsukuyomi
Circumstantial Evidence A: Sasuke defeated Naruto at the Valley of the End
Circumstantial Evidence B: Naruto is currently tied up protecting the alliance, fighting the Juubi and has to deal with Madara and Obito, thus he is not at full-power
Circumstantial Evidence C: Seen above, Naruto had to train to control half-chakra Kurama. We have no reason to believe Naruto can arbitrarily handle full-chakra Kurama out of the gate
Circumstantial Evidence D: All three databooks place Sasuke as stronger than Naruto
Circumstantial Evidence E: Many manga events suggest Sasuke is considerably more intelligent than Naruto and has been involved in more life-or-death fights. Sasuke has an expressed interest in killing Naruto, whereas the opposite is not true
Circumstantial Evidence F: In their most recent confrontation at the bridge, Sasuke was holding his own against SM Naruto despite being nearly blind and fighting Ay, Mizukage and Danzo