HOT SPRINGS, Ark. – With trainer D. Wayne Lukas, the glass is always at least half full, the sun is always shining, the next race offers another chance to win, the next crop of 2-year-olds is going to be the best one yet. He’s relentlessly positive, and even Wednesday morning, reflecting on the death of his only child, Jeff, three weeks ago, Lukas chose to look at the good, not dwell on the bad.