What's more important for the purposes of the analysis of overall player performance? A 2-month sample, a year of data, or years of data? I can dig countless examples of guys coming up, providing one-two months of crazy stats, regressing, and ending the season as a below average player. Sometimes, it's luck, sometimes a player adapts, the league adapts back, and they don't have an answer for it. We all know Wacha is who he is, a guy with mediocre stuff who doesn't strike out or overpower a lot of batters. That's who he is.