The rest of the Jinchuriki besides Naruto, Gaara (now a former), Killer Bee and a bit of Yugito, lives and appearances throughout the entire manga. So far, I felt that was so random and most of them were interesting (Fuu for example), yet the potential was thrown out of the window.
Seriously, that could've been the plot of Part 2 instead of chasing Sasuke and bringing him back.
Derock, my man... YOU JUST GAVE ME AN AWESOME IDEA FOR MY FANFIC!!!!!!

That idea of focusing on the other Jinchuriki besides Naruto, Gaara, Bee, and Yugito is genius!
Of course,as I said, I would have liked to have seen Bee with some of the attitude he obviously masked, like hating A to an extent for keeping him locked up like a caged weapon.
Another subplot that should have been explored is if Kakashi resented Naruto because he was reminded of Minato since Naruto's Minato's son. After all, it would have explained, besides Jiraiya's request, why Kakashi hardly took the time to properly train him and even possibly Sakura, and it would have explained a lot.