Cueto also has 17 win (17-6) and leads the NL in ERA at 2.48. In 27 starts, he has 2 CG and 0 SHO. His 172 ERA+ leads the NL and is percentage points behind Gonzalez in HR per 9 IP at 0.4. He has thrown 181 2/3 innings, striking out 144. He has a 1.123 WHIP and has given up 8.1 hits per 9 IP.
Dickey has a 17-4 record with a 2.63 ERA. In his 27 starts (28 GP), he leads the NL in CG with 5 and SHO with 3. His 191 1/3 IP and 190 Ks are both higher than Gonzalez and Cueto. He also leads the NL with his 1.014 WHIP. His hits per 9 IP is slightly under Gonzalez (7.1), has a 144 ERA+ and has given up 0.8 HR per 9 IP.
As far as the other contenders, Kershaw (12-8, 2.85) leads the NL in GS (28), IP (192 2/3) and Ks (192). Zimmermann is 9-8 with a 2.63 ERA. Strasburg is 15-6, 3.05 and leads NL starters with 11.1 Ks per 9 IP. Kimbrel (0-1, 1.29, 32 saves) has 88 Ks in 49 IP (16.2 K per 9 IP) and Chapman (5-4, 1.27, 33 saves) has 113 Ks in 64 IP (15.9 Ks per 9 IP).
Overall, the edge probably goes to Dickey. Though I don't believe that the voting should be held against Dickey because he throws the knuckleball, I think it will matter that the Mets are not a playoff team. If it does come down to the three of DIckey, Cueto and Gonzalez, Dickey has to stand out to get the edge over the other two. I think Dickey has distinct advantages in winning percentages, IP and Ks in addition to his league leading numbers in WHIP, CG and SHO. But the other two pitchers should be considered and will have the advantage if the numbers are too close. I'd like to see Dickey run off the next three in a row, which in my mind will almost clinch it for RA.