Most relievers are drafted as starters, aren't they? You don't have to draft a reliever to have one, you can convert a starter, or get one via trade or free-agent signing.
Hoffman was a shortstop, just like his brother. Most of the players selected where either starting pitchers or shortstops at some point in the career. Baseball America has said that they are behind the curve when it comes to evaluating college closers. Maybe because too many people hold onto an outdated belief that failed starters make good relievers.