I see Jill's experience as that of someone who goes from being a student teacher, working under a cooperating teacher who is in the classroom most or all of the time while the student teacher presents lessons. Even though the student teacher is in charge, the cooperating teacher has already set rules and procedures in the classroom in order to make the classroom management go smoothly. Years ago, I worked with a really nice first-year teacher who had very poor classroom management skills and very poor lesson planning skills. I don't know what her student teaching experience was like, but I can't see it possible that if you student teach with a very strong teacher who still likes to maintain some of his or her own control in the classroom, that when you get your own classroom it would be a lot harder to effectively set rules and procedures, maintain discipline, and possibly even create lesson plans.
Jill was an enforcer and a sister mom and a situation where many of the children if not all of them had been blanket trained, taught instant obedience, and probably faced harsh punishment. now, she is the one responsible for setting of the rules, procedures, and limits, but her sons seem to respond in a different way. She also has a very different co-parent than what Michelle did. although we didn't see it, I know Michelle and Jim Bob had two parents the older children in order to set up a system where their daughters could be sister moms. Just based off what we've seen, Derek has a different personality than Jim Bob and co-parents in a very different way.