Walt Weiss possesses a dry sense of humor. But even he wasn't about to feign concern after his Rockies were unable to hit Jeremy Guthrie for four innings. He has more pressing issues. Like trying to whittle down his roster. The Rockies will announce it by e-mail, so no need to worry about faulty fax machines, typos or rogue agents. The rotation, defined by injuries and inexperience, is set, barring Christian Friedrich unexpectedly racing past Drew Pomeranz for the fifth spot. The lineup writes itself with only third baseman Nolan Arenado, who had three hits Tuesday, capable of jarring the establishment. Even if he ends up in Triple-A, he's only a hot streak away from Coors. The bullpen has crystallized. There remains a question if the Rockies will keep seven or eight relievers. Three — Chris Volstad, Manny Corpas and Edgmer Escalona — are competing for likely two spots. One of the most intriguing plots sits behind the plate. Typically backup catchers are as replaceable as Spinal Tap drummers. But this year is different. You should care about this because the decision could affect the future of prized commodity Wilin Rosario. The decision is between keeping Ramon Hernandez or Yorvit Torrealba. Both are veterans with proven resumes on winning teams. They are good in the clubhouse and know their primary job is to tutor Rosario and help the pitchers.