Gardy's not the most articulate guy, but he's not a dope either. He went the long way around to say that at levels below the majors, you have to blend the stats of what actually happens with the judgements of the coaches who are watching the individual pitches. If the pitcher is making "his" pitches over and over all the while with good deception, and if the batter is laying off the pitches in the dirt while taking a good swing at the ones he should handle, then the coach/manager down there will report that, and they are ready. Stats that are (potentially) built up by taking advantage of those opponents who execute correctly less often, count for less. (Not all that different in spirit from stats like BABIP and xFIP at the major league level, but with a visual element added.) At least, that's my take.