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I have seen outfield range improve, but it is very rare. The improvement is also usually pretty minor (i.e. 5 point on the 20-80 scale). I've seen it go down way more than improve. Same thing with infield range altough I've had more instances of infield range improving.
Infield arm and outfield arm I've also seen improve, infield arm more often than outfield arm. Infield error and outfield error I've seen increase a lot more often. Turning double play is probably the rating I've seen increase the most often and in the most drastic manner.
As with all prospects, work ethic and intelligence seem to give you a better chance of the prospect reaching or even surpassing his ceiling, along with good coaching at all levels.
It it were me, I would purposefully draft and trade for prospects who are already good defensively but have room to grow offensively. You also have to keep in mind that fully formed defense first players are usually cheaper and can be acquired from the high minors and the benches of other teams readily.
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