Photo by Brian Fluharty/Getty Images Al Horford, Boston Celtics The Boston Celtics are seeking a second straight NBA championship. Joe Mazzulla’s team is considered one of the favorites heading into the postseason. However, once we look beyond the playoffs, there are a significant number of questions surrounding the Celtics. As currently constructed, Boston’s payroll for next season sits around $500 million in salaries and taxes . It’s expected that the front office will look to make some moves