His command has remained alarmingly inconsistent. His explanations are starting to sound more like excuses. Roki Sasaki has done little this spring to inspire confidence that he will be an effective starting pitcher this season. But he will be on the Dodgers’ opening-day roster. “He’s going to be one of our starters,” manager Dave Roberts told reporters this week. Asked by Bill Plunkett of the Southern California News Group whether Sasaki was one of the team’s 13 best pitchers, Roberts offered