When it comes to prospect rankings, evaluators must factor in potential alongside on-field performance. It says something about the talent on display when a player can walk more than a batter per inning and still have scouts raving that he has the potential to be “an ace, top of the rotation on a playoff team” as one scout did following the 2018 season. Over the course of his professional career, Luis Medina has teased the Yankees, scouts and fans with one of the highest ceilings in baseball, while at the same time struggling to find the strike zone on a regular basis.