Even under the circumstances at the time, even adhering to the normal rules, if Zhou Tian could, it would still be best to remove all the original members of the ruling class. After all, times have changed, and the territory Zhou Tian occupied used to be under the joint rule of many forces. In their situation, where they couldn't unite, Zhou Tian annexing them didn't need to worry about those Heavenly Eye Users causing any trouble.
This time, however, the situation was different because back then, Zhou Tian aimed at a castle where most of the Heavenly Eye Users were originally members of a single force. In that scenario, the Heavenly Eye Users who originally ruled the castle definitely had more influence over their subordinate Heavenly Eye Users than ordinary ones.
Thus, Zhou Tian could tolerate the continued existence of leaders of the small forces he annexed, but he had already decided early on to eliminate all the high-position Heavenly Eye Users in this castle.
