Kurama!! (chapter)

Summary
After Naruto push the rod, Tobi summons the Demonic Statue of the Outer Path, controlling Son's Chakra. Naruto figures out that the chains in Son's stomach isn't broken yet because of the Demonic Statue Of Outer Path is controlling Son's Chakra. Then Tobi absorbs Son and makes the other Jinchuriki in their full versions. After Naruto talks with Kurama, Naruto releases him from the Seal.

Trivia

 * For the first time in the series, Naruto calls the Nine-Tailed Fox by his real name, Kurama.