"Oh, they still recovering. After all, they have to sacrifice a lot to create the S-rank Human Bug Hybrid." Maroon replied.
The Demon Lord nodded. One of the hardest part of making the Hybrid appeared more independent is his inability to create S-rank monsters.
Oh, he can prepare the scenario but he cannot make them whenever he wanted, only when it was convenient of him.
And even if he could do so, he still need to sacrifice an S-ranker, as the Guild would not let the monster escaped for destroying an entire nation, even if its just a Tier 2 Nation. Not with one of its branches destroyed.
Sacrificing an S-rank monster for keeping the ruse would be foolish, forcing Alros to look at different ways to convince the Adventure Guild that is was an independent action.