But from LSU’s perspective, why Pelini?

The answer is simple. He’s one of the great defensive minds in all of football, and his defenses have proven to compete at a championship level.

Pelini’s three years as LSU’s defensive coordinator were the first three years Les Miles was the head coach. LSU went 34-6 during that stretch, and Pelini coached a Top Ten defense in each of those years.

Source: You’re Nuts If You Complain About A Bo Pelini Hire At LSU