When Danny Ainge put together the Big Three in 2008, Ray Allen was a major part of the equation. He was a big-time player expected to hit big-time shots, which he's excelled at over the past few years.
However, the veteran shooting guard had a rough season in 2012. Due to injury, Allen lost his starting spot to Avery Bradley's ability to do what Allen does...only better. He was briefly effective as the sixth man, providing much-needed offense coming off the bench. However, Allen was almost nonexistent during the playoffs, with the exception of a couple of clutch performances after Bradley was sidelined with injury.
Back in January, Allen asked for a multi-year extension with the Celtics. In that case, Boston needs to part ways with the 36-year-old veteran. Rumor has it he's looking to join a rival organization anyway.