Before this gets out of hand with misinformation as per usual, it has NOTHING to do with SFEC's. If you read the SA Fire and Emergency Services Regulation 2005, you'll find:
SECTION 9 — Brigade officers
(1) Pursuant to section 70 of the Act, each SACFS brigade will have the following officers:
(a) a brigade captain;
(b) unless the Chief Officer otherwise determines—at least 2, but not more than 4, lieutenants (with the order of seniority of the lieutenants being decided in a manner determined by the brigade);
(c) with the approval of the Chief Officer—1 or more senior fire-fighters (with the number of senior fire-fighters not exceeding the number of lieutenants and the order of seniority of the senior fire-fighters being decided in a manner determined by the brigade).
Thus, without the express permission of the Chief, no Brigade should have more than 4 Lt's. Some groups are far firmer with this than others. Reg's trump SFEC.
Stirling has 5 also.
Are you 110% sure about that? It's not the 80's anymore, and Mt. Lofty Group did have to deal with this specific issue in recent years.