Judging by the situation in that castle now, even if the relationships are not particularly good, most of the Heavenly Eye Users within that castle should be familiar given how long they've survived and their comparable status.
Thus, if Zhou Tian can gain support from certain Heavenly Eye Users and then demonstrate his nearly invincible strength, then even if they do not truly favor Zhou Tian, it is likely that most of the Heavenly Eye Users in that castle will comfortably accept his rule at that time.
Unquestionably, voluntarily accepting Zhou Tian's rule and passively being governed by Zhou Tian will result in different circumstances. And only when the Heavenly Eye Users within that castle cooperate fully can Zhou Tian annex that castle without severely impacting his strength.
Given that Zhou Tian has already made up his mind, in light of the situation at the time, he merely needed to act according to his own thoughts.
