If we're talking about control, with his BOSS Authority, Zhou Tian initially had all the lesser monsters under his command. Not to mention their actions, even their life and death hung on a single thought from Zhou Tian.
Now that he had become an Emperor-level BOSS, Zhou Tian's control over those lesser monsters had, unbeknownst to him, risen to another level.
According to what Zhou Tian had just learned, after becoming an Emperor-level BOSS, his Authority over his subordinates wasn't limited to the oppressive power of being a BOSS. Furthermore, with his newly acquired abilities, Zhou Tian could now summon clone bodies of his lesser monsters at any time. What delighted Zhou Tian was that upon becoming an Emperor-level BOSS, he would form a personal world that was unlike the traditional world.