sup folks, if you have difficulty looking at the pics, i found a site where they are larger image.
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it seems, naruto is so quick, pain's eyes can barely see his movement, i mean after i looked at the pics. first he was staring at naruto then, pein was looking behind seems surprised and naruto just throw one rasengan to the other pein.
Wow thanks. OK, that makes much more sense upon seeing the pics larger.
1.) Now that we know that it was a Rasengan that hit that body, it makes much more sense that Naruto could one-shot it.
b.) Recall, that the chidori is a jab, so too can be Rasengan. In that attack it seems that the Rasengan is an augment to his regular punch, thus making it like a jab.
c.) One amazing thing is how fast Naruto formed that Rasengan. I say it was fast because of Naruto's speed in having to intercept that body before it hit Tsunade. He had very little time to form it, and I presume that's due to sage mode. Also to respond that quickly it's likely it was formed one-handed since it would take too long to form a shadow clone first. That has been a major flaw in his use of the Rasengan. Shadow clone's give the enemy too much time to respond to the jutsu. Recall that Jiraiya ask Naruto if he intended to get stabbed every time he was going to use it during their training together.
d.) That's going to make Naruto hella difficult to fight if he can consistently use Rasengan as a jab. It also may be stronger than regular Rasengan too even though they appear the same.
2.) This Pein body shouldn't have been a weak one if Pein expected it to kill to Tsunade with two ANBU there (not like they do much but watch).
b.) The other possibility is that Pein sacrificed that body for position (think chess). It may also have been sacrificed in order to learn Naruto's abilities before really fighting him.
3.) I wonder if Naruto is going to be too fast for the Sharingan to track and respond too an attack. Also, his reflexes are faster than human in sage mode. Unavoidable attacks are based of off human speed and reflexes. Given that, Naruto's speed and reflexes may make those jutsu possible to avoid (not saying they are, just saying it's possible).
4.) In addition to sage mode, I would posit that Naruto's fighting style has also change more to a toad sage in that summoning jutsu are going to be a key factor in the way he fights. This means that he'll summon a variety of toads beside Bunta and Kichi the way Jiraiya did.
5.) We still don't know how strong Naruto is, and he took out a Pein body in one-shot. Pein is going to step it up a notch, as will Naruto. This battle is going to get even more interesting.