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Over the past 20 years only 2 prospects from BAs top 100 list have been successful with a minor league K-rate higher than Trayvon's 28.6 K% (per ABs).
Russel Branyan and Wily Mo Pena are the biggest "successes" over the past 20 years with the highest minor league K-rate.
Success, under the study below, is defined as having over 1500 MLB ABs.
http://www.minorleagueball.com/2011/4/22/2123847/the-significance-of-min...
Only two players in the past 20 years from BA's top 100 have managed 1500 ABs in the MLB with a higher K-rate than Trayvon.