If I want to take an extra g:servant attached to my Hakim or Tomcat can I just deploy it in the disconnected state, and will it just reconnect at the end of the order the controller enters the table on?
No. It needs to deploy at the same time as the Trooper. So since the Zondbot can't AD it must deploy in the DZ during the deployment phase, which means the Tomcat must as well. "G: Servant: Deployment G: Servant troopers will be deployed at the same time their Doctor/Engineer is deployed as if they were a single trooper."