If we're talking about an army of thirty thousand grass baby soldiers, that certainly is a grand move.
Even the small-scaled grass baby soldiers, when placed on the battlefield, are so numerous that they spread as far as the eye can see.
In an era with underdeveloped productivity, each soldier requires ten civilians for upkeep. Thus, thirty thousand grass baby soldiers might require three hundred thousand ordinary grass babies. Even if the maintenance of grass baby soldiers is less burdensome and the ratio is less terrifying, it is nevertheless extravagantly costly and labor intensive.
According to Zong, the Predatory Class's guard team only consists of a few hundred people, who are capable but limited. After all, Zong's team also contains hundreds of people, so it should be unnecessary to use thirty thousand grass babies to deal with this guard team, right?
