Too much of a good thing? Not when it comes to maintaining the gold standard. For if we have only recently celebrated the way Medaglia d'Oro is confounding the self-fulfilling prejudice against aging stallions by continuing to produce runners like Good Cheer and East Avenue, then he now demands a sequel addressing his equal prowess in the kind of role more conventionally reserved for a stallion of 26--namely, as broodmare sire. Last weekend, daughters of Medaglia d'Oro gave us GI Gamely Stakes winner Be Your Best (Muhaarar {GB}); GII Santa...