The Boston Red Sox were in desperate need of a starting pitcher, and president of baseball operations Dave Dombrowski delivered the goods Thursday by trading for San Diego Padres All-Star Drew Pomeranz. The move gives Boston a solid No. 4 starter and fills a major void in the back end of the rotation. But the cost was high, as the Red Sox sent highly-touted pitching prospect Anderson Espinoza to San Diego in return. So, was trading for Pomeranz a shrewd move that can help Boston make a serious playoff push or a short-sighted gamble on a largely unproven pitcher that could backfire if the 27-year-old left-hander doesn’t pan out? First, the good news: ...