Let's be clear. These are friends of the court, not any kind of advocates. They work for the court. They are not adversaries to the executive.
What, for example, will happen if the court systematically ignores them? Can they go to the media? What can they do but resign? That will make the nightly news and be forgotten by morning.
This creature is called a "court," but, lacking adversarial advocates it's wholly an instrument of the executive branch. Adding some friends with impressive resumes does not change that.