3. Kellen Moore, Chargers offensive coordinator
Kellen Moore was a practice squad player for the Dallas Cowboys in the mid-2010s. Once he hung up his cleats, he became their quarterbacks coach in 2018. He got promoted to offensive coordinator the following year, and Dak Prescott enjoyed a highly productive three-year stretch under his tutelage.
But even when Dak Prescott got hurt in 2020, Moore was able to keep the offense afloat with Andy Dalton and Ben DiNucci taking turns behind center. Also, Moore consistently got the most of his running backs, whether it was Ezekiel Elliot or Tony Pollard. You could argue that he had lots of talent to work with, but he didn't have a full deck in 2022 and the Cowboys still managed to rank fourth in the league in points scored.
Moore joined the Los Angeles Chargers as their offensive coordinator last year. While it wasn't perfect, most of the offense failures fall on the front's office inability to bolster the roster. Austin Ekeler was somewhat underwhelming but that's because he was running behind a porous offensive line. The fact that Justin Herbert suffered a season-ending injury didn't help matters, and the Bolts finished 21st in the league in points scored and 18th in total yards.
The past three years, Moore has earned consideration for head coaching jobs. Heck, he was seen as a potential candidate for the Jaguars' vacancy following the dismissal of Doug Marrone and one year later after Urban Meyer got the boot. Moore just interviewed for the Chargers' opening at head coach, but he would probably be open to making a lateral move if he doesn't get a promotion.