Some interesting theories there...
kakashi8944@ What you posted is what everyone wants to see ((kakashi e hinata alive) plus (naruto having control over the kyuubi)), but as you know, no pic no proof. And it sounds like joke for me.
Don't think is on a killing spree, he isn't dumb and I know he knows exactly what he's doing. Right now I'm beggining to understand kishi's style as he wants to show us a twisted version of the classical good vs evil, where good can be evil and evil can be good. We grew out with a greater empathy for konoha, but if you look close, they're just a military force fighting for their own objectives.
About Hinata, the key factor is in fact inserted on that polemic frame where each person have a different version of it. To make an accurate calculation, we need to first know the position she is after being thrown away by Pain's jutsu and we must know what's rock, what's Hinata and what's blood. By trying to draw the whole extension of the picture, I'm 100% sure that's indeed part of her body and a uncommon straight trace shown above her jacket implies that part of the rod is indeed behind her clothes, but stops abruptly somewhere before where her body ends and the ground begins. Still, the chances of survival isn't that small.
About the "third clone", I believe if it's around there, it already have done something. I believe the clone disappeared and was not shown because it isn't important for the plot.
About the last sage clone, I don't know for sure if it's still here but disappeared after naruto had his chakra drawn out by fat pain. Remember his clones always disappears when his chakra is drawn out? And I don't think it's used to give naruto control over the kyuubi.
About six tails, I think it isn't the limit and it'll go further in the tails number and his seal will be fully released, I know it's a bit to improbably, but since I saw the transformation, I had that impression. If I'm wrong and he will fight at six tailed stage, I don't have any prediction about the results of this fight, mainly for naruto's side. Nagato is running out of chakra and is clearly pushing himself beyond his true capabilities as he believe he's about to complete his objectives, that was indeed accomplished if it wasn't for Hinata's interruption.
As usual, Guy's team will have a important participation there, as kishi never show anyone if he/she will not have any participation on the current plot (the same when he show hinata few chapter previously the current one, where she was indeed the focus). He (kishi) also have a motive for not putting them on the middle of chaos, so they currently have the highest chakra levels and stamina from all the others konoha-nins that was at konoha the moment of the huge explosion.
If even lee was there before, as he's currently the only one that stand a chance against deva pain. If you look close, his gravitation thing acts like gaara's sand shield, but he waste chakra and have a 5 seconds delay, and we know what this guy can do in a matter of seconds if he wish to.
That's it for, now, sorry for the huge text. Peace.