According to the current Monster Rules in the Main Plane, Zhou Tian has already stopped placing much emphasis on the strength of monsters. Even if Zhou Tian was still as before, wholly focused on developing the power of the Beastman Tribe, as long as he could achieve his goals, he wouldn't care about the casualties among his Beastman subordinates. After all, according to Monster Rules, with enough resources on hand, the ordinary Beastman monsters are like cannon fodder, meant to be sacrificed.
Thus, no matter how the Ancient Beings behaved at the time, although the number of Beastmen they killed seemed high, based on the foundation of the Beastman Tribe today, even if they killed many more Beastmen, Zhou Tian might need only a few minutes to replenish those lost Troops.
