One reason is that those Divine Kings are quite confident. While they do not believe they can easily take down other Divine Kings, they still think that the ultimate victory will definitely belong to them.
Another reason is that they do not consider Zhou Tian to be a threat.
Having lost the help of the Divine Emperor's treasure, Zhou Tian is merely a True God. Given the power of the Divine King, even if fighting numerous opponents alone, as long as they face only a True God, defeating them, even when heavily injured, would be as simple as slaughtering chickens or dogs.
Thus, at that time, from all aspects, Zhou Tian was never regarded by those Divine Kings. Since they never considered Zhou Tian significant, during their struggles, they naturally did not think about whether Zhou Tian would take advantage if they ended up exhausting each other.
In fact, even Zhou Tian himself never thought he could overcome that group of Divine Kings in such a situation.
