Outfielder Zac Veen and catcher Drew Romo, two of the Rockies’ prized prospects, were sent down to minor league camp on Tuesday. They impressed, big-time, during spring training but they still have a lot of tuning up before they are big-league-ready. When reporters asked manager Bud Black if either player could make their big-league debuts this season, Black answered: “I could potentially see it happen.