*shrug* believe what you want. Historically, pitchers don't show the same steady rise through their first few years in the big leagues that hitters do, and while there is a decline phase for those who make it that far, many don't last long enough for it to come up. So while there is still a bit of a curve to it, the pitching aging "curve" is much flatter. Meanwhile, pitchers tend to show sudden leaps and declines in performance more often than hitters. The leaps are usually correlated with an overnight improvement in command, the declines with arm attrition. Our whole organizational philosophy is based around these ideas.