Let me just ask, why talk like you've actually seen Shippuden Naruto at 100% strength? Also, just cause he wins a battle doesn't mean he's going to win the war.. there are still a few Pein bodies left, and one of them has the remaining chakra of the 4 other bodies! Still, even if he manages to force Pein's retreat in a weakened state, how do you figure Naruto can't win no matter what? O_O
1. I agree with you that we have never seen Naruto fight at 100% since after he did the Kakashi training method...
2. Didn't the 5 other bodies of Pein collapse before he used the atom-bomb technique?
3. I think that what was meant to be said by Konan, was that she wanted to give Pein some of her own chakra, so he could revive 1 or more of the collapsed bodies... I doubt Konan has the ability to heal someone...
4. Why does everyone think that Pein is a threat? He eliminated every potential person that could harm him... thats why he pulled out the "ace card" ie atom-bomb... He just never counted on Naruto coming back to Konoha right then.
5. IF Pein does try and kill Tsunade, despite seeing Naruto being back.... It means that Pein does NOT plan on fighting Naruto... because he wouldn't have bothed to wasted what little chakra he has left, to try and kill a completely exahusted Tsunade. (unless it was on purpose, most likely retribution for being the last Sannin).
7. I am picturing Pein being a coniving ass monkey, and fighting dirty to take out someone who is wounded. Remember that all the bodies were laying in one spot, so one of the dead bodies would have to be ressurected, then go back to where Tsunade was... Yahiko's body of Pein was up in the air looking at the blast site. SOOO if what the spoiler is saying is true... Konan will have to intervene with one of the disabled bodies, revive it with her own chakra... all in order for Naruto to kill it again... as the spoiler suggested...
Sorry if that took too long to write, but if you think about it logically, it has to happen...
I predicted all this in previous posts for the past month... ie Naruto returning, rescuing Tsunade before she is killed, with Sakura crying, and Kakashi half dead... everything, so take my word for it

I am good at puting the pieces together... ALSO...
If I am REALLY a fortune teller... don't be surprised to see Sasuke return to Konoha. When he enters Konoha, he'll see Konan fleeing for her life without Pein (because the bodies were all destroyed)... Sasuke will let her pass because he knows her from Akatsuki, and like he doesn't care about what they do... THEN he will see Konoha destroyed, and then be in shock, feel guilty. Naruto and Sakura will be crying, and when they see Sasuke, they will be expressionless... and blame him... Sasuke will then realize that he just F'd everything up.... (People can't make changes in their life until they hit rock bottom, and now he has, not even Naruto and Sakura care about him) He'll eventually remain a nomad and refuse to stay in Konoha... in order to take down Akatsuki, and regain his honor.