Getty Brad Stevens, Boston Celtics Finding a long-term solution to the starting center position is arguably the biggest task facing Brad Stevens and the Boston Celtics . During the offseason, Boston lost three key members of the front court. Kristaps Porzingis was traded to the Atlanta Hawks . Al Horford joined the Golden State Warriors in free agency. And, Luke Kornet received a significant pay rise by heading to the San Antonio Spurs . In their absence, both Neemias Queta and Luka Garza have