The bussiness conector is a necessary service to enable the interaction of Applications from EP with the AOS so it is required.
The web user session can be far greater than the current user logged in. It depends of many factors, including the navigation with more than 1 window at time, or processes started by that web user. These web users licenses howeaver consume “enterprise portal Licenses” and not Client licenses. So in this situation you are consuming 2 client users the current user and the bssiness conector.