And it is also a point from which Youm gets to follow the example of Rimuru.
Aka sparing and gradually making loyal subordinates out of people who first acted as enemies.
it's actually a good decision from Youm to let Edward leads the Anbu. the Anbu listen to Edward, and Edward fears Diablo. they will never act against Youm ever again
Definitely knocked down the danger level of that secret police from "deadly" to "farcial". (While still allowing for that when it comes to tyrants who are not actively out killing people, making everyone laugh at them is a pretty solid strike.)