Twins prospect right-hander Kyle Gibson will miss his scheduled start with Triple-A Rochester on Wednesday due to elbow soreness. It wasn't too long ago that Gibson looked like a good bet to make his major league debut this season, but he had a 5.17 ERA over six starts in June and has allowed 13 runs over his first two outings this month. The Twins are convinced that the 23-year-old right-hander will only have to miss one start, but there's reason for concern here.