The strikeout rate on 20 year olds is overstated and does not really stand alone. You got to look at the K/BB ratio as well. Here are a few age 20 (and a couple 21 year old) season numbers: Sano: 27.2 K%, 2.18 K/BB M. Cabrera: 24.3% K%, 3.36 K/BB H. Killebrew: 39.4% K%, 3.90 K/BB Mike Schmidt (21) : 24.6% K%, 2.44 K/BB A. Belle (21): 27% K%, 2.84 K/BB and here is the kicker: PA/HR (same seasons with age in parenthesis) : Belle (21): 15 Sano (20): 15.1 Killebrew (20): 22 Cabrerra (20): 28.3 Schmidt (21): 33.5 Oh, and one more guy: Bo Jackson. Age 23 (AA): 38.2% K%, 3.68 K/BB, 30.3 PA/HR Sano is THAT good folks... And his ceiling is above all the aforementioned.