ALLEN PARK — The Detroit Lions and coach Dan Campbell face one of the coaches that knows the most about them outside of the organization when Ben Johnson’s Chicago Bears come to town on Sunday.

But the familiarity with the Bears coaching staff doesn’t end with Johnson as their defensive coordinator has known Campbell even longer.

Dennis Allen, former head coach of the New Orleans Saints, joined Johnson’s first-year staff running the defense and is another of Campbell’s close friends in the coaching world.

While there’s plenty of familiarity with his aggressive style of defense, Campbell knows as well as anyone who tough it can be to crack a unit Allen runs.

“He’s an excellent communicator, knows how to teach, energetic, passionate. All of those things are always going to rub off on you

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