PELLA—Colton DeRocher has built a life of solving the unsolvable, yet there’s still one nagging question he can’t answer. Why baseball? There are easier pursuits to tackle with only one fully formed hand. “I’d ask my parents when I got older, how did I gravitate towards baseball?,” said DeRocher, a Central College senior right fielder from Sioux City. “My mother wasn’t really even an athlete and my dad raced motocross, so it wasn’t really a traditional sports family.” There was no reason to envision a future as a record-setting hitter for the Dutch, or selection to the Louisville Slugger Warriors,…