That's the way we try to structure it. Each has varying responsibilities when protecting the quarterback. There has to be room for Brett to step up. The tackles have a little bit more leeway. They can turn their guys and run them upfield, but the guards and center have to stay square and not give a lot of ground.
Teams can buttress the pocket by having a running back block a defender.
Packers fullback William Henderson sometimes draws that assignment. Being the fullback, you have to be patient, but you have to be aggressive when the opportunity comes. Developing a sound pocket and maintaining the integrity of it is more complex than it seems. The people sitting in the stands think they just fire off and try to kill the guy across from him. It's far from that.