Gibbs was a well known proponent of the zone blocking scheme and popularized its use while he was offensive line coach of the Broncos.[3] Denver became famous at that time for its use of smaller and more agile offensive linemen and the success of its running backs, most notably Terrell Davis.[4] Gibbs was to enter his first season on Pete Carroll's Seattle Seahawks staff as the assistant head coach and offensive line coach in 2010,[5] but announced his unexpected retirement a week before the start of the NFL's 2010 regular season.[3][6] In May 2013 he returned to the Denver Broncos in a consultant role for one year.[7][8]