I don\'t have the data but it\'s more than have won the Derby. Yes, 2yo foundation helps. You\'re asking a lot for a horse to be unraced Jan 1 and to be accomplished enough even to enter by the Belmont, let alone win it.
In general, the studies we use for the seminars (tops, off races etc.) are the best way to study these things, but if you\'re going to go by results, you are better off using in the money than wins. It gives you a larger sample size and distorts less.