The Mentalist Can someone explain the ending of the last episode?

cobrafan111 posted on Oct 23, 2010 at 10:22PM
I get that Holwell actually switched Castor and Pollock. From what I understood Castor was supposed to be the one racing (riden by Sam) but was secretly traded out for Pollock. Soooo why did Castor end up winning? That makes no sense.

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