Teams must be authorized to create team culture. They must be 100% free to invent, create, manifest and work inside their own special, unique, meaningful, largely self-determined team culture.
Ground rules set the stage for culture. All else follows. If the ground rules prevent teams from creating culture that is all theirs, then the team is dependent on outside authority and that team can never reach the hyper-productive state. The team is by definition a Zombie team ™.