They thought it was all over. They thought they had won. But no. A mistake was made. By taking Chuck's powers, Jack didn't just become God, he allowed God to attach himself to Jack, like a parasite. Chuck still has power, he's still the ruler of the universe. God takes over Jack's body without anyone realizing it. Team Free Will's story is not over yet. And this is where it picks up. Based off the Tumblr theory/thread because it's amazing and we all need more Supernatural.