PHOENIX -- Versatility is a wonderful attribute, but at times it can be a mixed blessing. Sure, becoming proficient at a few positions might accelerate a trip to the Major Leagues. But when a player gets comfortable in one spot and is told to learn a new one, that can lead to frustration and, ultimately, delay a callup to the Major Leagues. That's the situation for Grant Green, who is playing in the Arizona Fall League for the third time and learning his fifth position, as he continues to grind his way up the Oakland Athletics' organizational chart. This time, the former left fielder, center fielder, third baseman and shortstop is playing second base...
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