Obito did not set the kyubii free on that tragic day . It actually was madara. But due to his old age he was much weaker. But just as obito was slipping into insanity after learning that rin passed, he learns that it's not too late.
Watch as naruto follows his mother and fathers footsteps and becomes a seal master and the hokage with the help of his best friends Rock lee and Hinata Huyga. narutoxhinata