The D-Train will be back in 2021, but someone else will be making sure it runs on time. With the Friday reports that the Green Bay Packers will move on from Mike Pettine, the kinds of candidate Matt LaFleur interviews — and the person ultimately given the job — will tell us how big an overhaul the organization believes this defense needs to get them to Super Bowl quality. If he believes in the talent, in the investment Brian Gutekunst made in overhauling this unit, Mike Smith or Jerry Gray would offer continuity in the scheme with a new set of ideas at the top.