A foolish consistency is the hobgoblin of small minds. Mr. Endsley made it clear that the cup depth measurement was really a measurement from the rim to the bottom of the cup, thus the cup depth includes a measurement of the rim depth as well.
Nothing is ever that simple.
At first glance, there are a number of screaming anomalies. Of course, one of my favorite mouthpieces, the popular 14B, escaped measurement all together. It makes sense that if on can feel the difference between inner cup sizes of .006, that one would notice a rim being 0.012 inches greater. Neither the 11 or the 12 is an Artist Model, though they are both among the oldest mouthpiece models that Schilke makes.