So even if Wacha isn’t the example, you’ve still shown that 3rd time through the lineup is worse for more pitchers.
I looked at career numbers, too, but (especially with Hill) that leaves the problem of weighing innings from a long time ago equal to today. And for Hill and Wacha (and probably Eovaldi), they’re likely not.
Obviously they saw something in Wacha they liked, because so far he looks like a steal. Ditto for Hill.
And it really didn’t even seem like strong analytics to think a pitcher would be less effective third time through the lineup. Hitters are more familiar and the pitcher is more tired. The logic is simple.
But the flaw is relying on the bullpen to be more effective. And lately for the Sox, the bullpen has been volatile. This is likely to be something that happens too often if they keep relying on the pen for 4 innings every game, a situation exacerbated by the ridiculous usage of Houck as a piggyback for one pitcher only.