This story was excerpted from Thomas Harding’s Rockies Beat newsletter. To read the full newsletter, click here. And subscribe to get it regularly in your inbox. CHICAGO – Almost counterintuitively, being in the Major Leagues has made preparation a more efficient proposition for the Rockies’ Troy Johnston. Until his 44-game debut with the Marlins late last season, Johnston, 28, was a productive Minor Leaguer without a spot. The Rockies claimed him off waivers after last season.