Most of the racing world was likely asleep or otherwise occupied late Friday night, but the small fraction that was awake and watching the action at Remington Park may have witnessed the breakout of a star 2021 3-year-old as well as the birth of a feel-good story of the year candidate. Senor Buscador (Mineshaft), a homebred with just one 5 1/2-furlong start under his belt, was slow out of the stalls in the $200,000 Springboard Mile S. before rocketing past every rival in the 10-horse field to score a dazzling...