How about having different jobs that can be assigned to different members of the SG. One guy would get to be the banker. One guy could design the defenses. This could help divide up the work off being the Leader and get more people involved in the group. This could go along with the different ranks, or just let one person who doesn't want to be a leader but likes making bases have a job.
You could even have one guy set as the SUPREME OVERLORD, who can do anything. This would be me