I’ve pointed out quite a few times the luck that Ben Johnson had as a part of his turnaround of the Lions offense. The year Anthony Lynn lost his playcalling duties, their all pro starting center Ragnow missed 13 games (not to mention their starting LT missed 9 games and their staying RG missed 10 games). Those guys come back healthy the following year, and Detroit suddenly has one of the best offenses in football. Follow that up with an influx of skill position talent from a few good drafts, and continued health on the OL, and their dominance continues.