Originally Posted by
NextGen1
You have to understand the concept of anime in general, it's always unbelievable. the concept is Naruto grows up to be one of the strongest ninja in the village, he defeats pein with ease, because he has determination, and he won't give up, and to speak seriously, if it wasn't for sage mode, he wouldn't have done so well, plus the accident of the second sage mode.
point is, he is stronger then all of them, and the moral is, with determination, you can do whatever you want.
but isn't that the theme of just about all anime, not supposed to be believable, it's fantasy , Bleach, Dragonball, naruto , yu yu hakasho, hunter x, full metal alchemist, Samurai Deeper Kyo, Samarai X , almost always the same theme.