Is the discussion about what has made Buehrle and Dickey more effective than Hutchison despite Hutch not having worse DIPS? Because the answer to that is that it's a combination of a lot of things. Buehrle is an elite defender (which isn't just fielding balls - he's almost impossible to steal on). Dickey is an elite defender, and throws a knuckleball which tends to help pitchers outperform their DIPS. These skills have allowed them to give up fewer runs, which allows them to go deeper into games. Throw in poor luck for Hutch, and defense that as far as we know is average at best, and it's not a mystery why he's thrown fewer innings.