[Editor's note: This is an early release of one story from the Husker Extra Nebraska and college football preview section, "Drafting a Game Plan", on newsstands and in Sunday's Journal Star. Buy one Sunday or check back @HuskerExtra.com for more from this year's section.]
Al Groh is considered to be a leading expert on the 3-4 defense.
Just ask Bob Diaco.
The first-year Nebraska defensive coordinator worked under Groh as a linebackers coach at Virginia from 2006 through 2008. During his introductory news conference at NU in January, Diaco referenced Groh, describing him as a "great teacher.