Originally posted by: Edort4
I still think that no matters how yamato is going to die. He is like a trump card with his kyubii control jutsu, as long as they have that naruto cant be fully used as a weapon, or give himself to rage again, if Yamato is always there for containing purposes.
On the contrary, I think Naruto can never revert from kyubi form back to normal without the aid of advanced trump cards like Yamato's seal.

If Yamato is gone, then the next time Naruto goes 4+ tailed kyubi, it may leave him with no choice but to work up to 9 tails, in which case he'd probably kill himself.