Since the Instructor could create courses/lessons and topics and manage the users of the same.
After our recent update of version 3.3.0, the Instructor Role plugin now supports and provides access to various LearnDash groups-related options for instructors.
Now, Instructors have the ability to create and manage groups similar to a LearnDash Group Leader.
Instructors can create new groups and add any student enrolled in any courses created by the respective Instructor or shared with that Instructor only.
Instructors can then also assign themselves or any other group leader as a group leader for their groups.