Curt Schilling is the only other player to date with more than 20 bWAR with Arizona, with 20.9 (and 26 fWAR, which also places him fourth on that list). His total career values are similarly impressive, including 69.7 bWAR (and 86.1 fWAR). Curt’s biggest problem is the length of his stay in Arizona; in his career, which spanned from 1988 to 2007, he only played with the D-Backs from 2000 to 2003. On the other hand, his Diamondback years were some of his best, and the only team he pitched more games for was the Phillies. When you add in the fact that he was co-MVP on the team’s first World Series Championship, and he just may have enough to offset his short stay.
After those, Steve Finley is the only player who legitimately stands out from the pack in any way. His 18.7 bWAR puts him 7.5 ahead of the next closest players, Dan Haren and Craig Counsell. And his 20 fWAR puts him 8 ahead of Chris Young and Stephen Drew. Yes, Finley was one of the team’s first stars. But I’m not sure if that’s quite enough to put his contributions to the team above the other four that I’ve mentioned so far. For the record, in his career, which lasted from 1989 until 2007, he posted totals of 40.5 bWAR and 44.3 fWAR. He was probably better than you remember, but his Diamondbacks’ run only went from 1999 to the 2004 trade deadline. That may not be long enough for Arizona to retire his number.
After that, the list of potential candidates is basically current Diamondbacks. Stephen Drew and Chris Young are high on both lists (Drew ranks fourth on both with 12 fWAR and 10.7 bWAR; Young ranks seventh in bWAR with 8.8 and third in fWAR with 12). Despite both currently placing high, neither has been consistently All-Star quality in their time with the team, meaning that they’ll either have to break out soon or stay with the team for a very extended period. Ian Kennedy and Daniel Hudson are both showing promise, but both are just starting their careers; we’ll need more time to get a truly accurate assessment. Really, the D’Backs’ best bet as of right now is easily Justin Upton. The 23 year old is having a break out season, and is still under team control through at least 2015 (if not longer). So he certainly has the time to build up a track record. And he has a slight head start; he’s sixth in fWAR with 11, and fifth among hitters in bWAR with 11.5. A strong finish this year could actually move him into third place on both lists.