MADISON, Ala. — The team-building exercise was simple. Early this season, coaches at Rocket City, the Angels’ Double-A affiliate, asked each player to step forward and share something personal with the entire squad.Name a hero in your life, a hardship and a highlight. Zac Kristofak, a 25-year-old starting pitcher, began internally preparing for his turn. In a way, he’d already spent more than 10 years building toward this moment. And while any cursory Google search of his last name would have turned up the disturbing details from a decade ago, none of his teammates knew the full story.When Kristofak got up to speak in front of his teammates, there were no nerves. His heart did not pound. His mind did not race. The words tumbled out.It was Dec. 22, 2012, a cold afternoon in the Atlanta sub...