Cueto has 210 innings with a league best 149 ERA+. The next closest NL pitcher is Kershaw with a 143 ERA+.
Cueto is certainly in the running. I don't know where I would vote for him just yet because I would like to line up a whole bunch of numbers first, but if you have 210 innings and easily the best ERA+ in the league, I would lean toward you should be near the top of the voting.