CRM isn't necessarily about teamwork. It's about managing resources. One can execute a VFR flight in uncontrolled airspace and never see or talk to a soul, and still utilize CRM. It's about managing the resources one has, from fuel to services to cockpit organization to the engine. It's about the conduct of the flight.
The FAA prefers to stress ADM now, which is Aeronautical Decision Making. Same thing from a different view.