You are describing positions of leadership -- a leader doesn't need to communicate downwards (with their title) to the street gangs or to the patients. They are going to lead those people, so it is unnecessary.

The people from hacker school are going to be lead, and mostly not hired straight into a position of leadership, so it is necessary to communicate to the leaders-to-be a title which communicates well what that person has been up to, because everything that person does will be taken into account by that leader-to-be, and more closely inspected than the gang member or patient will inspect the title of the person helping them.