We don't know the circumstances of Pein acquiring Yahiko's body, there is a possibility that it could still be Yahiko so there is absolutely nothing wrong with my reasoning.
And as far my disagreeing with your other statement there is a reason. Simply this unless Pein comes after Naruto, there isn't really going to be any confrontation between them and there really is no reason to say that Naruto will be the one to defeat Pein, it is a possibility but it might not happen. The reason I say this is because we still have no idea if Pein is going to turn out to be the main villain of the show, it could still be someone else at this point and him being the main villain doesn't mean Naruto is going to be the one to defeat him.
The main villain throughout the first half of the series was Oro and he ended up being defeated by Sasuke and to this point of all the Akatsuki members that have been defeated Naruto has only been responsible for one i.e. Kakuzu. So yeah it is possible that Naruto may be the one to defeat Pein but at this point, I don't see it happening and simply because Naruto is the main character doesn't mean he will be the one to defeat Pein.
Sasuke's confidence doesn't have anything to do with any power he has acquired. He has always been very confident as most ninjas are. I haven't really seen anything from Sasuke thus far that screams he will be able to defeat Itachi. Personally I think its way too soon for him to be attempting to do that, Itachi doesn't seem to be interested in fighting him anyway, this is just another test. I what to know what Itachi's motives are.
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