i think it varied. Jazz Prowl and Ironhide were all second in command. the autobots were a large army and prime cant over see everything. Jazz was more likely the inside guy who made sence of the planet they were on. as i understand it, Jazz was also known for creating some crazy plans that worked. thinking outside the box, and being able to immerse 1s self into makes Jazz a good top subordinate. Prowl, he's strict. see things through to the end. a real by the book guy. these qualities make him a good subornate as well since you know he'll get it done, and wont quit. Ironhide is a tough warrior. i think he has probably known prime for a long time, and is more along the lines of primes oldest friend within the cast, and i think he is someone prime can be a bit more frank with. the other autobots seem to have no issue taking orders from him either.