EPSOM, UK -- This is what vindication looks like: a usually composed superstar trainer with a hint of tears in his eyes, his chest heaving, the emotion a bit too much. City Of Troy was Aidan O'Brien's 10th Derby winner - but this one felt different. It would be ludicrous to say his credibility was on the line, but his words certainly were, and perhaps his judgment, at least in relation to last year's No 1 two-year-old, whose balloon had popped three furlongs out in the 2,000 Guineas. O'Brien has...