Board Thread:Theories and Speculation/@comment-25603214-20141031053314/@comment-10330822-20141031091307

Well, Gaara's Jinchuriki Transformation were referred to as "that jutsu" earlier on. Which means the transformation themselves are viewed as jutsu. Jiraiya might have meant that Naruto shouldn't used his Jinchuriki powers on the mission because he didn't have control over them yet. I don't think it could have been anything else. The Giant Rasengan was the only thing even remotely close, and I assume Jiraiya wasn't screwing around by having that serious look on his face to tell Naruto not to use the Reverse Harem Jutsu.