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It could just be well located pitches.  
For instance batter (A) comes to the plate. It is well known that batter (A) has a compact swing and likes to turn on an inside fastball. Fister with precise location gives the guy what he wants an inside pitch that is located outside the zone.  
Batter (B) comes to the plate. Batter (B) likes to extend his arms on low and away pitches. Fister in turn offers low and away pitches however they are outside the zone and simply fouled off the end of the bat. 
We've all agreed that his plus location pitches is what alot of his success is based on. He rarely makes a mistake and misses as evidenced in his low HR Rates not to mention his GB/FB rates. I'm not ambitious enough to check game logs and compare location to hot zone, but it may be a place to start.  Nibbling the hot zones (which is like playing with fire for some pitchers) and pitching to the cold zones.