Engagement is the number that can't be wrong, which is why it ends up at the top of the release and why a product leader should strike it first. The Tottenham release is the clean case: the useful work, about 30 systems replaced and 4.6 million fan accounts unified, is in the body, and the headline is the one figure that would look the same whether the agent worked or not.
The three definitions, the Gorgias numbers as Lemkin reported them, and the 200-cases-a-week dispute queue from my own pricing are in 86% Engaged, 20% Resolved: Kill the Engagement Rate Headline. The scoring method is One Support Agent, Three Resolution Rates.