Do I understand CoursePress right at if an user is an student he will be an "Subscriber (slug: 'subscriber')" in WP roles?
But what are an Instructor, also an Subscriber?
Could it be possible to make an Instructor to an Editor (slug: 'editor')?
Anyways we need to remove the roles that are not needed. Like the:
Author (slug: 'author')
Contributor (slug: 'contributor')