How big of a marketing team need to be considered "Leading Edge"?

A marketing team of 3+ people is generally considered "Leading Edge" because it allows for specialization and a division of labor necessary for advanced analytics. With at least three members, a team can typically cover key roles such as data collection/engineering, analysis/interpretation, and strategy/implementation. A single person, while skilled, would struggle to manage the breadth and depth of tasks required for leading-edge analytics. While 5+ or 10+ people would certainly be capable, 3+ is often the minimum threshold to achieve the necessary functional separation and expertise without becoming overly large or inefficient for many organizations.