The Cardinals have reached to Class AA Springfield for yet another rookie pitcher. This makes five who have been brought up during the season to join rookies Shelby Miller and Trevor Rosenthal, who started the season with the Cardinals. And there could be one more, the crown jewel, on the way. John Gast, Saturday’s starter who went out with left shoulder tightness, was placed on the 15-day disabled list Sunday and righthander Michael Blazek, 24, was promoted from Springfield, where he had seven saves and an 0.92 earned-run average in 17 games. Blazek, who was in camp with the Cardinals this spring, had split his time between starting and relieving in his career before being turned into strictly a reliever at Springfield. He was jumped ahead of several more experienced candidates at Class AAA Memphis. “He’s been throwing the ball best,” Cardinals manager Mike Matheny said. But the next move might create more of a stir. Gast’s projected turn against Kansas City on Thursday in St. Louis is open and Michael Wacha, the spring training sensation, certainly would be considered a candidate. “Everybody’s a candidate,” Matheny said. Wacha was scratched from a scheduled start Sunday at Memphis. But Matheny said the organization wanted to keep an eye on Wacha’s innings count in his first full pro season. He has thrown 52 2/3 innings in nine starts, with a 4-0 record and a 2.05 earned-run average. What is known is that general manager John Mozeliak will meet the team in Kansas City today and Mozeliak said a decision on Thursday’s starter would be made Tuesday.