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He was a small guy with a mediocre fastball who had to learn how to pitch before his growth spurt gave him height and mid-90's heat. Those guys develop work ethics to survive and almost as a reward get major league talent on top of it.
That's much better than the Yuniesky Betancourt or (player) Billy Beane types who are men-among-boys that can get by talent over hard work. Those guys have much more trouble adjusting when everyone has talent and what separates players is the extra work.
Pineda was the same way--first he learned to command his 89 mph fastball, then he got a 97 mph fastball.