Anybody who gets a new job is going to feel a compulsion to keep doing what it was that got them the job in the first place. That’s why we see so many first-time head coaches who move up from the coordinator ranks retain play-calling responsibilities, for example.
And it’s nothing new. It’s precisely why former Pittsburgh Steelers defensive coordinator Dick LeBeau was worried that his time might be up when the team named Mike Tomlin their next head coach. Having spent his career in 4-3 systems, serving one year as the Minnesota Vikings’ defensive coordinator, he very easily could have cleaned house.