CHARLOTTE, N.C. — The tackle box and fishing rods were in the trunk. The bass they didn’t catch still swam in the remote pond. The son, Duncan Davitt, was 9 years old in the passenger seat, and the father, Mark, was steering their gray Chevy Impala away from Illinois Street and back toward their hometown of Indianola, Iowa, when a question flashed through his mind. So the father asked it. What do you wanna do when you grow up? Dad asked. Play baseball, Duncan replied.