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Thought Experiment

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Pitchers A and B strike out 22% of the batters that they face and walk 7% of the batters that they face. They play on teams with DERs of 0.715 and 0.676 respectively, allow no home runs, and no hit batsmen. Can you tell me the K/9 and BB/9 of each?

A: 8.4 K/9, 2.6 BB/9

B: 8.8 K/9, 2.8 BB/9

Let's stop pretending K/9 and BB/9 are defence-independent. No, it's not a big deal, but we should still be looking at these things as a percentage of batters faced rather than depending on outs.