in all fairness, the GB% is yucky and very few major leaguers hit as many as he does
last year there was only 8 with a % over 60... kelby tomlinson, dawel lugo, eric hosmer, ryan flaherty, kevan smith, ian desmond, austin slater and charlie tilson
so he'll have to cut it down (he will likely not, do this) to become at least an okay hitter at the major league level
best case scenarios for prospects who hit a 60% GB rate in High A have been charlie tilson, braxton lee (70%!), ildemaro vargas, marco hernandez, travis jankowski, billy burns, luis sardinas, jace peterson, cory spankyburger, christian yelich.. and DJ Davis who is no longer playing baseball