DETROIT — For Kumar Rocker the road is not his friend. Rocker went just two innings in Saturday’s 5-1 loss to the Detroit Tigers. He threw just 43 pitchers, which led to Texas falling behind, 5-0. An exit that early usually leads to injury questions. There were none surrounding Rocker. He was lifted in the third inning for Cal Quantrill. But it wasn’t an injury. It was Rangers manager Skip Schumaker’s decision to remove Rocker from the game. Why? “I didn’t want the game to get away,” he said. “I thought that was the time to get Cal [Quantrill] in there.” Between Quantrill, Peyton Gray and Gavin Collyer, the Rangers threw six shutout innings of relief. Rocker gave up five runs and six hits in two innings. He didn’t allow a walk and struck out two hitters. He gave up a three-run home run to Tigers catcher Dillon Dingler in the first inning. A Josh Jung error at third base that inning didn’t help. But neither did Rocker giving up two stolen bases in a two-run second inning.…