We use different instructors/teachers within a course to teach certain topics within a course/modules/session and find it is not necessary for some instructors to have access to all of the course material.
Having the ability to limit them to only that sessions(s) module(s) folders and material they are responsible for could prove to be very helpful.
The instructor would also need to be available to students through canvas prior to and after each assigned session for a limited time.
Just the ability to assign modules and session to selected instructors would be great.