He's only 20, and seems to still have a few holes in his swing. This year he has 113 strikeouts in 362 PAs (split between A+ and AA), but that is down 172 strikeouts in 467 PAs last year at the Rookie and A levels. His walks are also up this year - 65 this year compared to only 50 last year...
http://www.baseball-reference.com/mi...d=gallo-001joe