If it feels like Ryan Mountcastle has been around a long time, it is because he has been. He was drafted in first round of the 2015 draft, the same draft that brought us Cedric Mullins. When the World Series ends in a few days and John Means becomes a free agent, Mountcastle and Mullins will be the two Orioles who have been in the organization the longest.
Before the minor league system became a behemoth stacked with the likes of Adley Rutschman, Gunnar Henderson, and others, Mountcastle was the big dog on the prospect lists. He was never ranked as high overall as those players, but he hovered near the top of the team list for several years.