So three things here.
First, in this post
You say quite clearly its not a child sacrifice cult. Yet in this update you quite clearly agree with me in that it is a child sacrifice cult. This collapses your previous stance which makes it difficult to discuss the matter with you.
Second, there is a difference between going in loud and going in silent. A few ministry people sweeping by is just them checking up on matters, nothing out of the ordinary. The Diao stepping in is a much bigger, louder deal.
Third, we do want to come back later with Su Ling, that's like the whole point. As long as the children get out than Ling Qi is happy. This is Su Ling's challenge and when the time is right Su Ling will be the one to kill Madam Grey. Building up good working relationship now with the ministry will only help that goal.