I was asking how it will feel for students who are looking their classes feed (or semesters feed in My Academics), since their list of instructors is based on this query. I worked with @jonmhays on that feed, and we specifically added the filter for instructor_func = 1 or 3 for that work. I don't remember the specific business reason why. It would be worth testing at the UI level as a student of one of these classes to see if it still looks correct.