As long as the pitcher called up is a reliever, however, it has the same effect. The Cubs don't need a fifth starter for awhile, so the immediate need is for 7 relievers as opposed to 12 total pitchers. By the time the 5th starter is needed Guzman will be eligible to be called back up. To your point, looking at the schedule, the next 2 times the Cubs need a 5th starter are May 1 and May 12. Technically, couldn't they bring Angel up on the 1st, send him down to Iowa for another reliever, and then recall him again on the 12th? Is that true if Miller is sent down due to an "injury"?