You're all talking without even knowing what their TRUE powers are. If we had all the ability of the 2 then there would be no problem, but we just don't know what naruto's been doing and we just don't know the real power of the rinnegan. Let's face it, I call it a 50/50 chance battle. Not only because we don't know their power, but also of the stake there is. On one side Konoha's destruction if he fails, and on the other the ''leader'' (for it's member) of akatsuki taken down. From that point on Kishi can surprise us with both side, that's a good situation he's put himself in...