An intact Free French state becomes an overmighty ally

After France's collapse, Britain historically dominated the remaining European Allied war effort. In this scenario Darlan arrives with a government, a worldwide empire, revenue, personnel, and one of the world's largest navies. That makes France an ally capable of bargaining over strategy rather than a dependent movement seeking British recognition. Darlan's focus on the Mediterranean and return to France would press the coalition toward early operations serving French as well as British priorities.