At the beginning, the strategy Zhou Tian used to establish himself had played a crucial role. It was not an overstatement to say that if it hadn't been for that method, he might not have grown so quickly. However, as the Beastmen advanced and evolved to have fewer long-range attackers, this strategy, which could have been considered a hidden trump card, had fewer opportunities to play a significant role in the later stages.
After becoming an Emperor-level BOSS, Zhou Tian's own strength had grown so formidable that he could handle any enemies on his own, and thus he never needed to utilize that strategy with the support of his Beastmen subordinates.