A Course Instructor can -
Be selected as the class in-charge for a lecture (Course Admin selects the class in-charge)
Have access to all the unpublished activities and assignments
Moderate comments in any discussion
Create and grade assignments
Create announcements
Access students' performance stats
At the same time, a Course Instructor CANNOT -
Add extra lectures
Add or remove students to the course
Add or remove members to the course team
Set or unset a class in-charge
Delete the course