What is communication? We saw what it looks like on defense when Kelcie McCray and Richard Sherman suffered a miscommunication on a formation switch against Julio Jones, but what about the offense?
Think of a coordinator as an organizer of suggestions. Play designs are a basic idea and most of the time, the concepts are adapted in game to attack defenses. This means you depend on speed, discipline and knowledge just like the defense does.
A quick example.
Marshawn Lynch catches a football in the red zone for a touchdown versus the 49ers. You remember it?