I would suggest that instead of using the Provider/Consumer web part connections, try this using session variables to filter employess by the selected manager instead. In qSelector, you need to provide a Session Name and enable Refresh Page When Selection Changed checkbox. In qListView, you can create a CAML filter condition that filters the rows based on the Session Name you gave to qSelector.
Unfortunately we do not yet support rendering unique values in a qSelector that is configured to a list which contains duplicate values for the display column. As a workaround, you could create a custom list that holds the unique names of all the managers, and configure qSelector to this custom list, so that you do not see duplicate options in the dropdown.