"The Rockies might be breathing a sigh of relief Monday.Manager Jim Tracy announced that the MRI result on Aaron Cook's sore right shoulder was completely clean."We got just a very, very glowing report that there's absolutely nothing structurally wrong with the shoulder," Tracy said.Cook, the ace of the staff, hurt his shoulder in the fourth inning Friday against the Giants. He walked Nate Schierholtz on four pitches and motioned to the dugout with his glove that there was something wrong with him."