fangraphs.com defensive since 1999; -12, -4, -3, 3.2, 8.0, 7.3. -1.4. 9.7, 5.0, 7.0, 5.1 -0.3 = 5/12, tossing out the first year in'98 when he didn't play much although the 3.2 year wasn't a full year either so he could be 5/11 as negative on a fully year including last year and is getting older. How is that skewing a conclusion? Ah, you used Total Zone for the first 3 years. Well, if you want to use Total Zone, lets use it (probably not very smart). -12, -4, -3, 2,1,0,4,2,1,0,11. Thats 3/11 years, and they were his first 3 years in the league. See how I managed to skew a totally different conclusion? In reality, the best we can do if we really want to look at defensive metrics is look at UZR over as long a time period as possible. http://www.fangraphs.com/statss.aspx?playerid=520&position=SS#fieldingadvanced 2 out of the last 9 years he has posted a negative UZR. The other years he has been average to very good. Don't like UZR? Lets look at the fans scouting report since I'm guessing neither of us have seen him play very much. http://www.tangotiger.net/scout/index6.php?prim_fld_cd=6 Last year (2011) Gonzalez ranked 4th out of all SSs. Guess where Yuni was? Second to last, mixed in which a bunch of guys who played half seasons or out of position. 2010, Gonzalez was 19th. Not too great, but I'm sure you can guess who came in dead last. 2009, Gonzalez was 20th. Again, guess who was last. I guess I can see arguing that Gonzalez isn't an above average SS. I just can't see arguing that he wont be a significant upgrade over Yuni, especially if you want to actually look at the stats.