Okay, last year, even when he wasn't exactly lighting the world on fire with his bat and for some reason forgot how to hit from his natural side, he had a high WAR, mostly based on his league leading Ultimate Zone Rating for third basemen, UZR: 16.5.  This year when he remembered how to hit from his natural side and seemed to be the first Padre to hit .300 since seemingly Quilvio Veras, his UZR drops to -4.0.  I understand that he has made more errors and has a .959 fielding percentage and he made 11 errors compared to 13 all of last year with a .966. Is that that different?  

If I am suppose to put value into this defensive metric, how can the same player playing on the same field go down 20 pts? Is he thinking so much about hitting from the right side that he's letting balls go down the line? Besides, isn't the whole point of this metric to eliminate the erroneous assumption that perennial Gold Glovers Cal Ripken or Derek Jeter who get to nothing but don't make errors are better fielders than a younger player with range like Alexei Ramirez.  Is Bartlett as bad as his -2.6?  Is Thin Gwynn who would average near 20 UZR as a Padre really that much better than Cameron Maybin who has a solid 9.0?  Is there a place to get Field F/X numbers?