Comparing Ranges of K% and BB%

Recently, I’ve begun comparing pitchers based on their K% and BB% going back to 2002, which is when batted ball data begins to become available on FanGraphs. My thought is this: pitchers have pretty good control over their K% and BB%, so those reflect true skill. What I want to see is a range of effectiveness for pitchers in the MLB within a set range of K% and BB% to compare players. I recently looked into John Lamb, who is a pitching prospect in the Royals minor league system. What follows is not a rigorous analysis but just something interesting I observed.