I've polled some of the people near me about chiefs and offensive forces. I think it's a good idea to work in groups. My experience is that a small well-organized and cooperative alliance will fare better than one three-times the size who lacks cooperation.
My suggestions: Don't publish the squad leaders. The less published leaders the better.
Everyone with at least 8 villages should be focusing on chiefs. I currently have four chiefs and will have five within a week -- spending one in a conquer and building two more. I'll be conquering tonight at about 11 p.m., but want six for the conquer afterwards, as it may be more difficult. I want to do it in one pass.
Two of those chiefs are in my offensive village. Those will never actually take a village, so they will always be available to assist someone else in a conquer (assuming I have the culture points).
In S1.com, our alliance had 15 players that conquered 40 villages in 50 days, because we were very active and very cooperative. Cooperation in this game rules above all.