Coach James Lemay at the Missouri state championships in 2015.

Eight months out of the year, most people called it the multipurpose room. It had the proportions of a dance studio or a chemistry lab — although it was neither — and inhabited the same basement hallway as the weight room and the lockers, containing neither weights nor changing areas. Two collapsible pitching cages hinted at one function, tucked against the near side wall, but for the most part their rolled-up turf served as a convenient bench for changing…