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That's what i was primarily questioing, Doc...your field-level view could still have at least SOME merit, but that's twice now that you've used range factor incorrectly.  2.95 from Winn (correct for the flyball staff and his RF looks perfectly in keeping with his career) and now 3.06 from Ichiro (again...the 2006 Mairners were a flyball staff outside of King Felix, though not to the same extreme)...
But I was not actually talking about PCA...I was talking about UZR, RZR, and PMR, which by the end of the season in 2006 made Ichiro look like a good center fielder but not a particularly eye-popping one...and that is, once again, perfectly in keeping with his performances in right field and his reputation.
RZR for Ichiro in 2006: .938 (very good but short sample),  in 2007: .893 (solid, but not eye-popping) UZR/150: 1.1, 6.7 (2006, 2007), Pinto: +19 plays 2006 and 2007 combined
Analyzing his performance with a statistic that is not badly biased by context significantly reduces the possible influence of Safeco on performance stats for our center fielders.
BTW, Reed, by UZR rated a +9.3 per 150 in 2006, but a -5.6 in 2007 and Randy Winn was a pedestrian +4.4 in CF in 2004.
Ask yourself, Doc...when was the last time the Mariners had a below average defensive center fielder starting full time?  Randy Winn was at least average out there, as was Jeremy Reed.  Cameron, Ichiro and Gutierrez were all noticeably better than average.
I'm not saying there's no bias...I'm saying it's probalby pretty small and it does not explain Franklin Gutierrez' far superior numerical performance in CF.