To understand Philippe Cambie's winemaking philosophy, you have to imagine what life is like in the center of a rugby scrum. Cambie is the most successful winemaking consultant in France's Southern Rhône Valley. He works with an impressive array of vignerons and properties. His name may not be as famous as those of his clients, but anyone wishing to discover the terroirs of the Southern Rhône could start by tasting the wines Cambie helps make. Wine Spectator's Mitch Frank explains.