From any perspective, after Zhou Tian merges with the World Consciousness, that world will be under Zhou Tian's control. Although this matter indeed has some flaws, when Zhou Tian held that idea in his heart, he still took action.
Even if in the future, due to the growth of the World Consciousness, it will eventually break free from Zhou Tian's control, at least in the short term, Zhou Tian is confident he can control that world. As such, the worst-case scenario would merely be that the world will break free from his grip in the future, but for now, it is not strong enough to affect Zhou Tian.
By utilizing the Power of the Worlds at that time, Zhou Tian is absolutely hopeful he can rescue his own entity. And as long as he saves his entity, even if the World Consciousness truly breaks free from his control in the future, Zhou Tian would still have gained from this situation.
