A comment in general... Sometimes high walk rates are a result of minor league batters unable to make any contact and deep counts. Many successful pitchers have seen lower walk rates in the majors than in the minors. I haven't seen Curtiss pitch in the minors so I am not sure how much of his ~12% AAA (17,18) walk rate is related to batters simply not making contact. Walk rates in the minors for batters and pitchers have interested me for a while. Liam Hendriks had great control and was leading the IL in ERA on year at 2.20 when called up. In the same league pitchers like Chris Archer, Jake Arrieta, Jeurys Familia, Justin Wilson, Dellin Betances and Matt Harvey struggled with walk rates much greater than they would have in the majors. Corey Kluber had AAA walk rates of 9.0% that year and 10.5% the previous. His major league walk rate this year is 3.4% and for his career 5.3%. I doubt there is a correlation between high walk rates and success. I also doubt there is a correlation between low walk rates and major league success. If you look at the 51 pitchers (100 innings) in that AAA group and sorted by walk rate. You need to get to number 25 of 51 Julio Teheran (7.5%) before you find a successful pitcher. Walk rates in the minors are deceiving and don't translate well to the majors. For a pitcher they might have stuff that minor league batters simply can't handle. Batters with a lot of walks might be missing opportunities to barrel up the ball earlier in the count. I am not discouraged by Curtiss' walk rate. I am not encouraged either but a really low walk rate would concern me more than a high walk rate.