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Eye ratio in and of itself is only a starting point.
Wilson's eye ratio dropped off alarmingly on his changeover to the AL. We infer not that he can't play baseball, but that we'd better be aware of the fact that he's having trouble changing over.
It is the DELTA in a player's strike zone ratios that is difficult to take lightly. 6 walks vs 17 strikeouts, for a guy just trying to fungo the ball through the right side, that is an overmatch.