In the final days of spring training, Derek Shelton was asked repeatedly about bullpen roles. His answer was always, “I don’t know.” As the Twins’ manager clarified, it was an honest “I don’t know,” and not an “I know but I’m not telling you.” As the season has gotten underway, that has become more evident. The Twins entered Friday’s late road contest at Toronto a game over .500 through 13 ...