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One thing that often gets overlooked because it is so hard to judge is just plain old mental maturity. Fister comes across as very cool-headed, and this is something that allows him to ratchet up his game without getting too emotional. Fister knows what his strengths are and has worked on them over the course of the last few years.
Sometimes it is more valuable for an organization to work with a young pitcher to maximize what he has rather than trying to bolster what isn't there yet...
Lonnie