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I wrote up a similar post ti this one a couple days ago, but it looks like it was somehow deleted.
The last time the issue of Guti's defensive value vs other CFers came up I put out this question but I can't recall the conclusion.
Is there a way to look at Guti's UZR (or appropriate defensive stat) at home vs at an away park as a means to estimate the Safeco effect?  Or to look at opponent CFers in Safeco vs at their home parks?  If an opponent CFer's defensive value reliably goes up in Safeco it might give some rough idea of the magnitude of the Safeco effect.
Could it be useful to look at Guti's (and other CFer's) UZR splits between hitter's parks vs pitcher's parks?  It seems like there might be too many compounding variables to make definitive conclusions (eg defensive chances change if there is a flyball pitcher vs a GB or strikeout pitcher, or there might be more defensive chances in a hitter's park than in a pitcher's park), but there might be some interesting info.