Using RA9-WAR, the K/9 leading rotations that you noted ranked 3, 5, 6, 8, 10, and 28. Using ERA- as I used, 2, 6, 8, 10, 12, 25 By either measure, they were 5 good starting staffs plus the Padres. What you claimed offered a better correlation with success than K/9 was BB/9. The top 6 teams in BB/9 for 2015 ranked 2, 3, 7, 8, 13, 14 in RA9-WAR. Outside the Padres (who had some notable defensive issues), that's not a materially different correlation than that of K/9. How about BB/9 in 2014? The Twins starters ranked 6th in MLB, and 30th (dead last) in RA9-WAR.