You said is that there there is no way that Dunkirk cannot bounce in his next race - The Fla Derby. Big Brown ran a big figure in the Fla Derby and not only did he not bounce in his next race, the Ky Derby, he ran a new top. He reacted in the Preakness but still won again.
Even if I dogmatically bought bounce theory as gospel, by your own reasoning Dunkirk should run even bigger in the Fla Derby and not bounce.
Whether or not young horses eventually react to big efforts is no sure-fire guarantee, as you are stating, that he will crash in his next race. The results of a horses efforts are questions of probabilities, like everything else in racing, not certainties. If you can show me that the p value of any horse running a big race, regardless of circumstances, bouncing big time after a big effort to be 1, I\'d love to see your findings.
Bob