If Zhou Tian's plan succeeds, the defense in the rear won't have any issues. But to achieve that, the difficulty would clearly not be trivial.
Firstly, Zhou Tian needs to possess sufficient territory. If the territories were divided such, without even mentioning where the vassal tribes would live, how would Zhou Tian be able to suppress the vassal monster races if he didn't have a larger piece of territory?
Moreover, arranging for other vassal monster races is also a problem. Thinking about it now, Zhou Tian felt that his act of acknowledging so many vassal monster races all at once during that time, was a bit inappropriate.
Of course, with the current situation and Zhou Tian not even being able to solve the most basic issues, there is no need to consider these problems at all.
