Staff are different from users. A user is a person who will login and access the app or manager dashboard, while a staff member is someone who can be attached to an incident report (patroller staff type), or attached to a dispatch event (lift operator).
You may have some overlap between staff lists and user lists but it's important to remember that not all staff are users, just like not all users are staff. For example, a Risk Manager who would not be assigned to an incident report or a dispatch event would just be setup as a user, whereas a Patrol Supervisor would be both a user and staff member because they complete/review reports and can also be assigned to incident reports/dispatch events).