One of the jobs of the front office is to be able to adequately account for a reasonable number of injuries during a season. A chief part of that is to have a reasonable number of Triple-A starting pitchers that can fill in, as needed, at the major league level. With a contending team like the Cubs, it’s reasonable to expect the Iowa Cubs to be able to provide for three or four options in the rotation, as needed. Before the All-Star break, Adbert Alzolay filled in, with varying levels of success. Faced with needing another substitution, Alec Mills gets the call this time.