Rivera Calderón, who emerged as a leader on his team, was invited to work at the student-affairs office, and he was asked to help interview a potential senior hire at the school, along with several returning students who were established leaders on campus. After the interview in late November, the other students joined Rivera Calderón for lunch, which is how he found himself sitting down, for the first time, for a meal in the dining hall that did not include any athletes. The returning…