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...would be whether the mariners' high LD% allowed was caused by the home field scorer having a strong bias (I believe he does have some bias...the Ms routinely have huge out of zone play rates...that does not square with observations really...I think the OOZ is from the scorer thinking too many fly balls are line drives.  But that's jsut a guess.
Otherwise the method is sound...and I DO think the Ms are better than their DER and UZR claim.