KISSIMMEE, Fla. — Few in baseball could have projected a long major league career for Quinton McCracken when he headed to his first minor league spring training camp 20 years ago. The 5-7 Duke graduate was the ultimate long shot. In a sport in which top college prospects are drafted and often sign after their junior seasons, he wasn’t taken until the 25th round as a senior. “You create your own luck,” said McCracken, the Astros’ new director of player development. “If you’re not prepared when the opportunity comes, a lot of guys fall on their face. That’s one thing we preach to these players. You have to be prepared. [...]