Questions on Managing Dust User Connections and Service Accounts

Folks, on connection admin I can have one Dust user setting up a connection using some other account, a service account for example. I have some questions on how this plays out... 1. what happens if I disable a user on Dust that has connected resources (using a service account) do we loose the connection? do we need to reauthenticate? 2. what happens if i disable a user on Dust that has connected resources using his own account? same questions as above. 3. what would be your advice regarding connections? The documentation says it is better to have a service account for this but do we also need a dummy user on dust (for example having the service account being also a user in Dust) 4. how can I tell which account a connection is using? (I can see the dust user managing it but not the actual account)