Is The Year Of The Great Fielder?

Below are the current top 18, through yesterday. The four from this year are in red. But at Baseball Reference, the league average, if I understand things correctly, has to be zero. That would mean that someone else has to be especially negative for these guys to be so high. Should they still have the high rank see here? I am not sure. Click here to go to the Baseball Reference leaders

Up date after games of 9-20: Simmons falls back to 5.3 fielding WAR

Rank	Player (age that year)	Def WAR	Year
1	Andrelton Simmons (23)	5.4	2013
	Terry Turner (25)	5.4	1906
3	Art Fletcher (32)	5.1	1917
4	Mark Belanger (31)	4.9	1975
5	Ozzie Smith+ (34)	4.7	1989
6	Brooks Robinson+ (31)	4.5	1968
7	Mark Belanger (24)	4.4	1968
	Frankie Frisch+ (28)	4.4	1927
9	Joe Tinker+ (27)	4.3	1908
10	Darin Erstad (28)	4.2	2002
	Carlos Gomez (27)	4.2	2013
	Manny Machado (20)	4.2	2013
	Rabbit Maranville+ (22)	4.2	1914
	Brooks Robinson+ (30)	4.2	1967
15	Hughie Critz (32)	4.1	1933
	Adam Everett (29)	4.1	2006
	Gerardo Parra (26)	4.1	2013
	Jack Wilson (27)	4.1	2005