But times have changed. As Kevin Goldstein pointed out earlier this winter, there are some convincing reasons to believe that Quad-A players do exist. Some players may have the tools necessary to destroy Triple-A pitching, but due to their skill sets — poor defenders, unathletic, slow swings — they have a difficult time succeeding in the majors. When you think about it in the abstract, prospects fail in the minor leagues all the time; at some point, everyone hits their ceiling. Some players can succeed in Single-A, but then can’t make the jump to Double-A. Others can thrive in college, but can’t make the adjustment to pro ball. When looked at through this lens, it’s unrealistic to imagine that Quad-A players don’t exist at all. The trick is sorting out which prospects have hit their ceiling, and which ones need to be given more time to adjust.Russ Canzler, Dan Johnson, and the Quad-A Label | FanGraphs Baseball Good stuff by Steve here.