And that thing is pass protection: http://www.packersnews.com/story/spo...aise/96847704/

Two head coaches already have told their offensive line coaches to study how the Packers pass protect and be prepared to implement those techniques next season.

“Our guy told our O-line coach you better teach it or we’re going to find someone who will,” a personnel director for an NFL team said last week. “Green Bay does a hell of a job with it.”

One offensive line coach already took the hint from his club’s head coach and has commenced a study of Green Bay’s pass blocking.
In 5 years they will name a rule after him, just like Mel Blount and Dave Casper.