One of the most perplexing and unwieldy beasts in baseball is the relief pitcher. Often coming via the most unexpected of sources—from the types who started as position players (Kenley Jansen, Joe Nathan) or starters (Andrew Miller, Wade Davis), to those who went from zeros to heroes (Dan Otero, Hector Neris?!)—finding relievers to count on is risky business. Even more challenging is building a relief corps from within: drafting and then developing young talent into formidable big league bullpen arms is a practice big league teams are still struggling to refine.