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Who was the last college player to K in over 20% of his PAs and become a star?
The best example I can come up with is Pedro Alvarez (19.4% K-rate), but he hasn't panned out yet and he really improved his K% in his Junior year (improved to 14.3%).
Who is a star at the MLB level right now that K'ed over 20% in college? This is really the base of my argument. They don't exist, because they don't pan out.