PHOENIX — There was nothing sinister or conspiratorial behind Major League Baseball schedule-makers sending the Rockies right back to the spot of their postseason demise, but their season-opening series against the Diamondbacks made for some early concerns. Arizona last October outlasted Colorado in a one-game, wild-card playoff with a few more timely hits and a more experienced pitching staff, and the D-backs pounced on the Rockies on opening day by grinding down Jon Gray.