BALTIMORE — Tugging on the curtain concealing the trainer of Fenwick, the longest shot in Saturday’s Preakness Stakes, provides a hodgepodge of clues like a jeans pocket, ripped shirt and disturbing stories about thumbs. In more than three decades, Kevin McKathan, of Ocala, Fla., has placed perhaps one horse under his name as a licensed trainer. His best guess is 10, 11 years ago, though he’s not sure on either of the points, which also have slipped the mind of electronic racing bible Equibase. Now, McKathan has a horse munching hay in a barn at Pimlico Race Course with a Triple Crown race loo…
