Grossman was the best left fielder in the AL who played a minimum of 800 innings. Just a few years ago, he was the worst defensive outfielder in baseball. Last year, Eddie Rosario was the second best defensive left fielder in the AL who played a qualified amount of innings, but this year, the metrics were not as kind to him. The impact of defense is overvalued, since better positioning and player development is what has the most influence on being good in this category.