From what I've gathered, Deadballers hurt your defense, while modern pitchers help, or maybe dont hurt your defense slightly.....some people seem to only draft opposites, deadball pitching, modern fielders, or deadball hitters and modern pitchers.....apparently the (modern/deadball) era of the batter has an ever-so-slight impact on the fielding too......I havent been bothered to be so strict towards this yet, I've in my very-limited slightly above averageness just drafted a mix of players and pitchers who feel right, mixing offense and some D