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Andrew Chafin
Nominated by James, who called him "a solid and consistent arm out of the bullpen." Chafin was also a nominee in Rookie of the Year, so let me copy-paste what was written there. Chafin was an excellent reliever, posting a 2.66 ERA over 66 appearances and 75 innings of work. Only one rookie since 2003 has posted a lower ERA for Arizona with a min of 50 IP (Daniel Hudson's 1.69 in 2010). It was also one of the lowest ERAs ever by any left-handed Diamondback reliever, trailing only Greg Swindell's 2.51 in 1999 (again, with a 50-inning minimum). While hardly a slouch against righties, holding them to a .225 average, Chafin buizz-sawed lefties to a line of 182/.260/.264.
Josh Collmenter
Nominated by ryeandi, writing "Opening day starter cast into a relief role. Didn’t bitch. Just did his job and did it very, very well." Normally, your Opening Day starter is hardly unsung, but after not being able to handle a starting job - despite delivering the Performance of the Year - Josh returned to his regular bullpen role and put up a 1.89 ERA there, over 32 appearances and 52.1 innings, holding all opponents to a .229 average. In 15 games, he threw two or more innings, and his rubber arm was very helpful: e.g. 4.2 innings on August 1, and three days later another 3.2. Had a shutout and a save for the second straight season, the first pitcher to do that since Tim Belcher in 1988-89.
Randall Delgado
Nominated by James: "Despite the "too many home runs" narrative, he actually brought his HR rate down a full one per game compared to the scary level it was at in 2013. He also posted an ERA+ of 126, all while being possibly the most flexible arm in the bullpen duty-wise. You need long innings? He can do that. You need a few tough RH outs? He can throw some 97 mph cheese and get those too. That ERA+ was third on the team behind Ziegler at an insane 221 and Chafin at 148." Not much to add to that. I'll just throw in one trivia nugget: Delgado's eight bullpen wins hasn't been surpassed in a season by a D-backs reliever since Oscar Villarreal won 10 in 2003.
Ender Inciarte
Nominated by piratedan7. "Stepped up to be a full time player, finished in the top 10 in batting, flashed some decent glove and arm and exceptional range…. it’s a shame he was expendable but he gave us our collective money’s worth as a franchise and got on base for others to drive home." Batted .303, and only one younger qualifying hitter in team history has hit .300 (Justin Upton, 2009). Inciarte was also the youngest NL hitter to bat .300 and steal 20 bases, since the Cubs' Starlin Castro in 2011. The others recently to do that double in their age 24 season? Hanley Ramirez, Carlos Gonzalez and David Wright, putting Ender in some pretty elite company!
David Peralta
Nominated by noblevillain: "had a monster season and took over the cleanup spot which was dreadful at the time." Peralta truly was a beast hitting #4 in the Diamondbacks' order this year: over 80 games and 317 PAs there, he batted .345, with a .952 OPS. Everyone else combined for an .870 OPS out of the clean-up position. Overall, Peralta's 139 OPS+ for the year trailed only Goldie among Arizona hitters with 100 or more PA, and David became the first NL batter since Bobby Abreu and Vladimir Guerrero in 2000, to hit better than .310 with 15+ HR as well as double-digits in triples.