The Raiders Group's memory contained traces of the Raiders, and it was when the "Wangcheng Strange Story" was about to fully revive that the Raiders, as the light of the city, were active in the streets and alleys, using their mere ordinary power to suppress the resurgence of the "Genesis Strange Story."
Yu Liang knew that this was an epic story worth singing about, with considerable difficulty, but he also knew that this solution was not perfect.
When he heard the Magician mention this problem first, he already understood this point. Since normal humans could think of this solution, why hadn't the "Human" Strange Story ever tried it?
The "Human" Strange Story controlled the memories of the Raiders Group; logically, they should have tried it themselves, right?
They hadn't.
Suppose it was a setting limitation of the "Human" Strange Story that prevented them from going back to the Wangcheng period to become the "Raiders." But surely, they could have someone else do it?