Half the B1G teams made significant changes to their coaching staffs. Seven teams got at least one new coordinator, and many were for various reasons.

Some were obvious (new coaching staff altogether). Others were a bit more random (leaving for lateral move).

Either way, it feels like the last two weeks have been nothing but new coordinator announcements on a nearly daily basis.

Here’s the latest on all of them:

INDIANA

Previous coordinator — Kevin Johns (OC)

New coordinator — Mike DeBord (OC)

Why the change — How does a coach go from leading the most productive offense in school history one year to fired the next? Well, the offense regresses significantly and the head coach “resigns.” IU’s 29 turnovers were the second-worst in the B1G, and the offense was mediocre at best for most of 2016. DeBord led an electric offense at Tennessee and he’s an Indiana native. Tom Allen’s first major coaching move appeared to be a smart one.

IOWA

Previous coordinator — Greg Davis (OC)

New coordinator — Brian Ferentz (OC)

Why the change — Davis retired after four decades in football, the last five of which were spent frustrating fans in Iowa City. Davis’ Texas-sized résumé lost its luster, and now, Kirk Ferentz’s son will get a crack at running the offense. There was no nepotism here. Brian Ferentz has been a key member of the Hawkeye staff coaching the offensive linemen for several years. That, coupled with his previous gig on Bill Belichick’s staff in New England, made him the obvious hire.

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MINNESOTA

Previous coordinators — Jay Sawvel (DC), Jay Johnson (OC)

New coordinators — Robb Smith (DC)*, Kirk Ciarrocca (OC)*

Why the change — Sawvel was actually brilliant in the Holiday Bowl in leading an incredible defensive effort against Washington State’s high-powered offense. But after he was hired, PJ Fleck understandibly wanted to bring his own guys in. He worked with both Smith and Ciarrocca at previous stops, which should help ease the transition process. Both Sawvel and Johnson should bounce back just fine.

*Not official

NEBRASKA

Previous coordinator — Mark Banker (DC)

New coordinator — TBD

Why the change — Another tough call for Mike Riley was letting one of his longtime assistants go. But Banker’s firing on Wednesday night was the result of Nebraska’s defensive disasters in big games. Against the three best offenses they saw in 2016, Banker’s defense allowed an average of 47 points per game. With the veteran-led group that Nebraska had, that shouldn’t have happened. That won’t fly for the next defensive coordinator, either.

wilson

OHIO STATE

Previous coordinators — Luke Fickell (co-DC), Ed Warinner (co-OC), Tim Beck (co-OC)

New coordinators — Kevin Wilson (co-OC), Ryan Day (co-OC)

Why the changes — There’s a lot to sort through here. Let’s start with the defense. Fickell got a long overdue opportunity to become a head coach at Cincinnati. That means previous co-defensive coordinator Greg Schiano is likely taking on full coordinator duties. Offensively, Urban Meyer did all but announce the firing of his offensive coordinators after the 31-0 Fiesta Bowl loss. Beck left for Texas to become Tom Herman’s OC and Warinner reportedly will join Fleck’s staff as Minnesota’s offensive line coach. Wilson, despite an ongoing player mistreatment scandal that got him “resigned” at Indiana, will presumably take over lead play-calling duties at OSU. With the addition of Day, OSU’s offense could look much different — and better — in 2017.

PURDUE

Previous coordinators — Ross Els (co-DC), Marcus Freeman (co-DC), Terry Malone (OC)

New coordinators — TBA

Why the changes — Jeff Brohm went out with the old and in with the new. Well, the new is mostly his staff from Western Kentucky, some of which are related to him. Though no official positions have been announced for Brohm’s new assistants, though it’s expected that Brian Brohm and Tony Levine will run the offense and Nick Holt will run the defense. Expect those announcements in the coming days.

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RUTGERS 

Previous coordinator — Drew Mehringer (OC)

New coordinator — Jerry Kill (OC)

Why the change — Perhaps the oddest was saved for last. Mehringer was the youngest Power Five coordinator, and in one year on Chris Ash’s staff, he did nothing to show he deserved the job. Rutgers was last in FBS in total offense and didn’t win a B1G team. So naturally, Mehringer bolted to join Herman’s staff at Texas. Of all people to clean up his mess, Kill stepped in. The former B1G Coach of the Year in 2014 left Minnesota in the middle of the 2015 season because of his battle with epilepsy. Now, he’ll be a coordinator for the first time since 1993. He’ll welcome the new challenge, as long as it doesn’t consist of going back to Minnesota.