AUBURN, Wash. – With the Emerald Derby fast approaching, what began as a 3-year-old division teeming with Derby prospects has been whittled to a select few. Couldabenthewhisky, the top 2-year-old at Emerald Downs last summer, will be among the leading contenders when the Derby is renewed for the 74th time Aug. 14, but the favorite’s role likely will fall to Zayda. Blaine Wright, who trains Zayda for owner Heidi Nelson, says he’s comfortable wearing the bull’s-eye.