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I don't want machines calling strikes, but this info is out there being used to explain or condemn. The strike zone shown is the "normalized strike zone", that is, a kind of a statistical average of all the batter's zones, IIUC. That does not mean each batter is judged based on this zone, it means that all the zones are plotted on a single plot for simplicity and clarity. The pitches are plotted relative to that.
So what do I take away from the graph? I don't know #5's exact location, but it was pretty close to the strike zone. For me Kellogg got it right. But I didn't see it live, and as I think we all agree we're the ones who know the "true" zone.
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