It was one of the most shocking moves in NBA history. In 2013, Ray Allen left the Boston Celtics to join the rival Miami Heat. The Celtics and Heat had one of the best playoff rivalries of the decade.

On one hand, "Ray-Ray" opted for a change in 2007 ... caliber team around him with Kevin Garnett, Rajon Rondo, and Allen in the mix. Even though Pierce's scoring average dipped, he was compelled ...