Everyone knows how the system works; how lavishly choreographed is the promotion of new sires. Center stage is cleared, the footlights are turned up, the make-up and costume departments go into overdrive. But we also know that most of them will go out there, clear their throats nervously, and murmur a few lines that barely qualify them, in the longer term, for a place in the back row of the chorus line. Every now and then, however, one of these rookies steps up and you sense within moments that a...