Jockeys swithching tracks?

I was just wondering if anybody had any good luck or stories with little track jockeys moving up and nobody giving them any respect until it was too late and you had already made a fortune because you knew he was great.

Harness Haters Lay-off, but Tony Morgan, one of the best drivers in the country and a dominant force in Chicago for years, left to go to Dover Downs earlier this year. This guys won at a 40 to 50% his first couple of weeks there and no one was hammering this guy, well a few of us were.
This would be like Johnny V. showing up in So Cal. and nobody knows who he is and they let him win for a couple of weeks before they hammer down the odds.