This might be considered spoilers, but anyways...

Someone once told me that Jiraiya's new technique is much more powerful than it first seems. The first time Jiraiya purposely made it weak so he wouldn't kill that other ninja. In reality the more chakra you put into the ball the more powerful it is, and after Naruto perfects it it is over 10 times more powerful than Sasuke's chidori. It's not meant for spinning the enemy, it's meant for damage. Spinning is only a side effect of forming the chakra ball. This jutsu=MASS DAMAGE