Nick, as you have stated, a player's defense can improve, as in the case of Plouffe. My theory is that the best way to teach defense is repetition in a simulated game situation and that some players need more repetition than others. When I coached little league, we had a kid from Russia on the team. The kid had never touched a baseball and did not possess any skill whatsoever in catching a ball, even a tennis ball. We spent many hours throwing the ball then hitting the ball to this kid and a few others. By the end of the year, the kid was able to make a game winning catch. I wonder how much time Arcia spends during the off season shagging balls hit by a live hitter. If Arcia worked diligently with good coaches to improve his defense, it seems to me that he could become a solid defender. He is not slow and his arm seems strong. With enough practice in simulated game situations, it seems to me that Arcia could learn to take better routes to the ball and make better throws. Maybe what works in little league stops applying at some level? My theory is that the best way to teach defense is repetition in a simulated game situation and that some players need more repetition than others, but improvement is always possible with repetition. Am I just dreaming, or could Arcia get a lot better with an optimum training regime?