That big jump is definitely due to UZR not being updated daily. I think it is updated weekly, on Mondays, from my anal retentive following of it. Also of note: It's not just a player's defensive performance that can cause a big jump in UZR. UZR measures runs above average. So everything that other players at your position do will affect your numbers. If the average shortstop (the aggregate of all shortstops) has a bad week, then you will look better in comparison. So, though Jorge Soler hasn't played in awhile, his UZR has been changing slightly from week to week, depending on how other players play defense. This is also another thing that is a bit of a problem with UZR. There was some discussion about this in 2014 when Alex Gordon had a huge WAR, thanks largely to a huge UZR in left field that came out of, well, left field. He'd always been a really good left fielder, but his UZR there in 2014 was way above his norm. And he wasn't actually making more plays. His OOZ (out-of-zone) plays made was actually smaller than the year before. It's just that the average left fielder was worse defensively that year, because a bunch of good defensive left fielders from 2013 either were injured, or started aging, or moved over to center field. I think this has actually affected Addison Russell quite a bit. He hasn't been quite as good defensively this year as he was last year at short. He's made about the same amount of plays out of his zone on a per inning basis. And his insider edge fielding numbers look the same, for plays out of his zone. But, he has made a few more errors this year. Last year he made all of the plays classified as routine on insider edge. This year, he's missed a few. Still, he's been very good. He's almost as good as last year, when he was probably the best in the league, in the time he played the position. And his numbers this year are still very good. Well above average in DRS and UZR. But, his numbers aren't crazy good like they were last year. And I think it has a lot to do with the influx of really good young shortstops. There's been a lot of old and bad shortstops replaced within the last year. Russell and Lindor have now played a full season, and both are exceptional. And they pushed out the numbers of the guys they replaced, Starlin and Jose Ramirez, who were bad. Corey Seager, who is also very good, took over for Jimmy Rollins, who was very bad. Zack Cozart, another one of the best in the game, was injured for most of last year, and Eugenio Saurez, who was dreadful, took his place. Ian Desmond has moved to the outfield, and Danny Espinosa has slid in at short and been good. Jhonny Peralta was slid off the position. Jose Reyes hasn't played there. It's just a much better group of shortstops, collectively.