The guys at BA rolled out the first league Top 20's today. The Arizona League was the first one. The Reds Gabriel Rosa came in at #15 and was the only Red among the top 20 prospects.
Just to clarify, this is the Arizona League, for rookies -- not the AFL for advanced prospects on the cusp.
With Rosa, the story is much the same as for most kids that age: has the tools, needs to work on his approach and the details.
Games are won on run differential -- scoring more than your opponent. Runs are runs, scored or prevented they all count the same. Worry about scoring more and allowing fewer, not which positions contribute to which side of the equation or how "consistent" you are at your current level of performance.