You missed Derby winner Orb in 2013. He also has Buckpasser in the X by way of his broodmare sire, Unbridled.
The percentage of starters with Buckpasser in the X is around 35-40%. By itself, Buckpasser in the X is not a good angle but if you add a fast final 3/8 in a 9 furlong prep race it becomes a very lucrative statistic.
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