Bud Black is relentlessly positive but is also a realist, especially about his pitching staff. The Rockies manager knew in spring training that the team’s bullpen would be its weakest link. He was right. As the Rockies entered the weekend with just 15 games remaining, the bullpen had the worst ERA (5.36), worst WHIP (1.54), and highest batting average against (.281) in the majors.