Seems like there have been quite a few household names in the past 6 years or so, spanning the likes of Rachel, Zenyatta, Wise Dan, Goldikova, Songbird, Chrome, Beholder, Pharoah, etc.
Any chance this relates to the ban of race day steroids around 2008? Stricter drug testing? Or a smaller foal crop? All 3? Or none of the 3?