ALLEN PARK -- The Detroit Lions coach staff endured the usual turnover that accompanies any head coaching change, parting with eight coaches last offseason.

But a year later, there's been nearly as much turnover in Detroit.

When Devin Fitzsimmons left for Vanderbilt on Wednesday, the Lions were parting with their sixth assistant since the end of last season. And that doesn't include Joe Marciano, who was fired as special teams coordinator in November.

Why so much turnover now? Part of that probably has to do with getting such a late start on staffing last year, when Patricia coached all the way to the Super Bowl with New England. And part of it surely has to do with the 6-10 finish.

Detroit wasn't nearly good enough in Patricia's debut season. Now the second-year coach is making some considerable changes to his staff. Here's a look at all the comings and goings this offseason:

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Mike Mulholland | MLive.com

Jim Bob Cooter

Position: Offensive coordinator

Years in Detroit: 2014-18

Breakdown: Originally was hired to be Matthew Stafford's quarterbacks coach, then became one of the hottest young names in coaching with his promotion to offensive coordinator in the middle of the 2015 season. At just 31 years old, he was the second-youngest playcaller in the NFL. (The youngest was a guy named Sean McVay, who has done stuff since.)

And you know what? The hire was a big hit at first. In 23 games under Joe Lombardi, Stafford completed just 61.7 percent of his passes for 6,123 yards, 34 touchdowns, 21 interceptions and a QB rating of 86.0. In his first 23 games under Cooter, Stafford completed 67.3 percent of his passes for 42 touchdowns, 12 interceptions and a QB rating of 99.5.

That's a huge upswing, and Stafford followed it with his most efficient season as a pro in 2017. That helped Cooter weather the coaching change last offseason -- but then the wheels came off in 2018.

The Golden Tate trade didn't help, nor the injuries down the stretch, but the offense was never really working at full strength either. Detroit ranked 24th in total offense, 25th in scoring offense and scored its fewest points (324) since 2014. And with that, Cooter was out.

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George Godsey

Position: Quarterbacks

Years in Detroit: 2017-18

Breakdown: A longtime offensive coach with coordinator experience, Detroit originally hired him to lend his expertise to the defense. But when Patricia came aboard last year, GM Bob Quinn urged him to part with then-QB coach Brian Callahan. Godsey moved back over to the offense to work with Stafford full time -- and after one bad year together, Godsey left to coach the tight ends in Miami.

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David Walker

Position: Running backs

Years in Detroit: 2016-18

Breakdown: After finding some success as the running backs coach in Pittsburgh and Indianapolis, the Lions hired him for the same position in Detroit in 2016. They finished 30th in rushing that year, then dead last in 2017. But they got on track last year behind the rise of rookie phenom Kerryon Johnson -- and just like that, Walker walked away from the NFL.

More than two weeks later, Detroit's upstart rushing attack is still without a position coach.

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Devin Fitzsimmons

Position: Special teams assistant

Years in Detroit: 2014-18

Breakdown: Was hired as an assistant to special teams coordinator John Bonamego in 2014, then served in the same role under Joe Marciano the last couple years. When Marciano was fired in the middle of last season, Fitzsimmons became de facto coordinator and the special teams improved considerably under his leadership.

But the Lions elected to fill the special teams coordinator position by bringing back Bonamego full time this offseason, and Fitzsimmons left for the full-time special teams job at Vanderbilt. (He'll also coach tight ends.)

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Derius Swinton

Position: Offensive assistant

Years in Detroit: 2018

Breakdown: Of the six coaches to part ways with Detroit this offseason, Swinton is the only one that wasn't a holdover from the Jim Caldwell era. Matt Patricia hired him last year as an offensive assistant, and Swinton added special teams duties after the firing of Joe Marciano. But obviously Patricia didn't like the fit, because Swinton was among the first coaches let go after the season.

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Steven Williams

Position: Defensive quality control

Years in Detroit: 2015-18

Breakdown: A defensive quality control coach brought in by Jim Caldwell in 2015. He was previously at Penn State, where he first served as a strength and conditioning assistant and then as an offensive/defensive graduate assistant.

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WHO'S IN

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Darrell Bevell

Position: Offensive coordinator

Breakdown: The Lions have been reluctant to offer particulars about what to expect from their new playcaller (what else did you expect from them?), but Bevell has a long resume that offers some clues. He was the Seahawks' offensive coordinator from 2011-17, where he rode Marshawn Lynch to top-five rushing attacks in four of his seven seasons. He was the coordinator in Minnesota before that, where he presided over more great rushing teams behind Adrian Peterson.

That suggests big things are ahead for Kerryon Johnson, who walked into an offense that had finished dead last in rushing the previous season, and promptly averaged the second-most yards per carry by any back in the league. Not bad at all.

But don't expect Bevell to forget about Matthew Stafford either. The Lions lamented Jim Bob Cooter's inability to change his identity from week to week. Bevell is expected to bring more balance to Detroit, with the game plan changing weekly based on matchups, much as its defense does under Matt Patricia.

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John Bonamego

Position: Special teams coordinator

Breakdown: Bono is back in The D. He was originally hired by the club as special teams coordinator in 2013, when rookie Sam Martin made his debut with the best punting season in team history. The following year, Detroit stabilized its field-goal kicking unit with the signing of Matt Prater. And of course Don Muhlbach was around, because Don Muhlbach is always around. Death and taxes, baby.

Bonamego left Detroit in 2015 to take the head coaching job at Central Michigan, but was fired in the middle of last season. The Lions elected to bring him back to Detroit, where he'll reunite with Martin, Prater and Muhlbach, a nucleus that had formed one of the best special teams units in the league until last season.

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Sean Ryan

Position: Quarterbacks coach

Breakdown: When Matt Patricia took over as head coach last season, GM Bob Quinn urged him to part with QB coach Brian Callahan. Patricia went with George Godsey instead, but then Matthew Stafford turned in one of his worst seasons ever as a pro. Now the Lions have parted with Godsey too, meaning Stafford is on to his third position coach in as many years.

Now it's Sean Ryan's turn to try to harness that big right arm. Ryan spent the last three seasons in Houston, where he worked as Deshaun Watson's quarterbacks coach the last two years. Watson threw for 4,165 yards and 26 touchdowns last year, his first full year in the NFL.

Ryan began his NFL career with the Giants, where he was an offensive quality control coach for the Super Bowl run in 2007 -- beating, of course, Patricia's Patriots. Ryan also coached wide receivers and quarterbacks there before making his way to Houston.