I think Leftwich did a great job getting the most out of Brady and the other veterans on the Tampa Bay offense these past three years. I think he’s unfairly being scapegoated for the Bucs’ disappointing 2022 season. But he’s a better fit for a situation like Denver, or maybe the Jets with a new veteran QB, then he is for New England, where success will depend in large part on developing a young QB. It’s not Leftwich’s fault that he hasn’t done that — the ghost of Bill Walsh couldn’t have turned Jameis Winston or Josh Rosen into a star QB — but where that’s the overriding need, other candidates are going to be a better fit.
Here's the problem with Leftwich, dude has no clue how to coach or call plays in the running game.
In his one year in Arizona as OC, they were 28th in rushing attempts, dead last (32nd) in the NFL in rushing yards, and dead last in yards/attempt. The following year after he left, they went 19th in attempts, 10th in yards and 2nd in y/a. Now, that's the year they got Kyler Murray, and Leftwich did inherit a bad running team when he took over, but it's no better in Tampa.
In Tampa, these his ranks in attempts: 14, 29, 31, 32, his ranks in rushing yards: 24, 26, 28, 32: His ranks in y/a: 28, 25, 15, 32.
Conversely, by passing yards, they finished 1,2,1,2. If you have a passing game that good, you should accidentally be able to run the ball as defenses load up to stop the pass. He could never figure it out. Again, he inherited a bad running team, but in 4 years, he did nothing to make them better, even when adding a GOAT at QB, Fournette in the backfield. In 2021, when they were middle of the pack ranked 15th in yards/attempt, Fournette averaged 4.5, Ronald Jones averaged 4.3, Vaughan averaged 5.0, but instead, he never ran the ball, finishing 31st in attempts.
Leftwich could be a great QB's coach again for someone, but as OC, his hatred for running the ball is always going to be a problem.