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...DNRA treats errors as expected outcomes of BIP too...Felix had more errors behind him than normal...I don't think that makes his ERA fortunate. I think it means the Mariners make too many mistakes whe he pitches. When ANYONE pitches, for that matter. They have a good defense, but they do make a lot of errors for being so defensively talented.
And of course, DNRA factors out the park and defense.