"Also many hitters tend to struggle when they change leagues. Alomar and Griffey come to mind. Other with substantial batting average drops in thier 1st NL season incluse Ricky Henderson and Mo Vaughn."
Well, to be honest, the Mo Vaughn thing probably also had to do with his taking a year and a half off from an injury, being past his prime, and being too fat to get down the line. I'm surprised they didn't have a table set up halfway down the first base line for him to get oxygen and gatorade. That guy was fat.