Kabuto's reanimation jutsu made 6 past jinchurikis. Obito got 6 dead bodies and reanimated them with his chakra rod. In this case, Obito got to take control of 6 reanimated jinchuriki that kabuto gave him. Since they were past jinchuriki, it was easy for Obito to put tailed beasts back inside of them. When naruto removed their chakra rods, they were no longer under Obito's control, but still remained under cabuto's control. However, they couldn't do anything because Killer Bee restrained them. And when the reanimation jutsu was released, they once again became dead bodies who are of no use to anyone. That explain it well enough? Correct me if i'm wrong.