One of the local HS teams almost never uses their best pitcher as a pitcher. All their pitchers are contact pitchers. Their fielding is generally pretty bad, but their best pitcher is also first team all-conference SS. So, they are a better team with their #2 pitcher and a great SS than with their #1 pitcher and no D.
Exactly what happens with DD. Her MS pitches her to get a sizable lead and then moves her to SS and has the #2 pitcher come in. This makes the infield solid. When DD is in the circle, there are gaps since the catcher and other position players need to be moved around. Good thing in school ball DD is a K pitcher and it works.