Spencer Horwitz had become one of the Pirates’ most important hitters before a hamstring strain sent him to the injured list. Alex Stumpf breaks down just how much Horwitz has meant to the lineup, why Ryan O’Hearn gives Pittsburgh a capable replacement at first base, and whether Jake Mangum, Tyler Callihan and Esmerlyn Valdez can help make up the lost production. Plus, with Konnor Griffin nearing a return, is this the right time to make him the Pirates’ everyday leadoff hitter?