I assume that after the showoff of sakura, she was almost akatsuki lvl, naruto has to beat/kill deidara, with kakashis help of course. It wouldnt make sense if he just gets knockout and kakashi fights and beats deidara alone or with gai team backup. Naruto needs to shine a bit, he seems to be one step behind everyone, he fell on genjutsu too easily, he went after deidara like a child without thinking, gives a poor image of the main character for too long.
About kakashi's mngekyo i hope that kishimoto has any explanation, the 3 coma upgrade was strange but this one... where did he get he idea to make a ninjutsu with his eyes? itachis was a genjutsu, he just made from 0? in 2 years? i know that he is a genius but this is way to much. Lets wait before bitching about this strange turn.
Bye!