Well Kastaway, your sort of wrong the only thing your right about would be the honorable death part (questionable) and the Shared Eye info.
THe honorable death thing is sorta weird, but if I were a ninja, not that I'd ever want to be one, I would rather die with people I know, not in the middle of some foreign village, rather I would die in my village protecting it or somthin like that.
Then there is the shared eye thing, he could have easily figured it out when he wasn't in the heat of battle, since he already saw ALL six of em and would have been able to escape, he would have been able to think his fight over multiple times before Pein came to attack the village he would have realized, "wow wtf there wasn't a guy with red hair with them (Nagato), and for some reason there is a dude that looks like someone I trained before... Hmmmm" So the shared eye one is questionable aswell, and yeah the JMan would have been able to train with Naruto, honing his skills in the sage aswell.
Think of it this way, it would have been JMan - One arm + Naruto + Ma + Pa + Tsunade(questionable) +Kakashi (questionable, since if Naruto came at the same time as he did before) vs the 6 Peins they would have had the upper hand I think since the whole 5 second thing would have been no problemo at all.
Naruto's maturity..... It QUITE QUESTIONABLE, please some one give me at least 3 GOOD examples of how he has matured that will help alot. Plus Naruto had matured when Yamamoto (Is that the wrong spelling seen so many mangas I forget now) told him he was the one who injured Sakura.
Thats all for now,
Peaze~~