Why trade for a veteran long reliever now? In another week the Cubs can call up Gallagher, Cherry, Ohman, Cotts, Petrick, Rapada and possibly Mateo. If they're putting in a long reliever, that means the game is already won or lost. If the Cubs are already down 4 runs, how much worse can putting Petrick in be than Silva? Also, why not just use Kerry Wood in that role?