Why Is It Important I Install Group Gator From the Google Apps Marketplace and Not the Add-on Store?

Installing from the Google Apps Marketplace is critical because it allows Group Gator to obtain the ability for non-admin delegated managers to borrow the necessary authority to manage groups they are not the owners of.  Purely installing Group Gator from the Add-on store will not grant adequate permissions. End-users, e.g., delegated group managers, should only access Group Gator from the Add-on store.