"He’s a fine fine coach and a great teacher, and I’ve watched him work on the field, and Andy knows ... the kind of person he is, the kind of teacher he is, the kind of (attention) to detail he has, and the understanding he has of defense," Vermeil said in an interview on 610 WIP. "Sometimes, you learn more about defense by coaching against defense. You’re confronted with all these problems, and he remembers all those things he hated, and that becomes part of his system." "One of the finest offensive coordinators ever in the National Football League, (Ernie Zampese), was a secondary coach, and (Chargers head coach) Don Coryell made him an offensive coach," Vermeil said. "Bill Walsh was a defensive coach in college. He coached secondary.