I just got "The Fielding Bible" by John Dewan and it includes some very interesting defensive metrics.
I'll share one in particular, which I think illustrates the problem with having Griffey in centerfield.
The stat is based on ball in play data, so the actual results from balls in play. It compares how many hits the Reds got with how many they gave up for each "zone" on the field.
Here is how badly the Reds were outperformed in 2005. Each zone for centerfield is listed with the number of hits given up followed the number of hits earned by the Reds for each zone.
**Hits in front of the center fielder: 95 to 64
(In english: The Reds gave up 95 hits in front of the center fielder and got 64 hits in front of the opposing centerfielder).
**Hits in the left field gap: 179 to 137
**Hits in the right field gap: 162 to 137
**Hits over the center fielder: 34 to 20
In other words, Griffey's range is not what it used to be. He is giving up more hits over his head and letting more hits fall in front of him than the opposition. By a wide margin. Of course, the gaps involve our corner outfielders as well, but we didn't fare well there either.
All in all, the defense needs to be restructured so we can catch some of these balls and help out the pitching staff.
The Reds are a beer league softball team. And, we can't pound teams into submission. We have to improve both the defense and pitching to move up in the standings.