The emergence of R.A. Dickey as an ace-level pitcher made for one of the best stories in baseball. The 37-year-old knuckleballer had started to show promising signs in 2010, but everything finally came together last year. Six seasons after he started tinkering with the pitch, Dickey seemed to finally master the knuckleball. He was rewarded with the Cy Young award, and finished first overall in Zach Sanders’ pitcher rankings. While Dickey’s 2012 performance deserves to be celebrated, he actually comes with some risk.