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The 2008 M's out conversion rate was deadeye equal with the expectation per pitcher MPH.
So we have been assuming that the Safeco factor that you mention .... if anything, we thought that it would would have *raised* the ballclub's glovework *to* the exactly-as-expected level.
So, obviously, the glovework itself would have been presumed to have been below average -- by whatever margin Safeco provides in a vacuum.
...........
If I'm not mistaken, though, when we say that Carlos Silva allowed 75 mph off the bat, that is measuring the entire flight of the ball -- meaning that Silva was giving up 75 mph after Safeco's crosswind cut the ball down!