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After letting Jason Terry walk, the Mavericks would be wise to sign a scorer to bring off the bench. Likely candidates would be Celtics guard Ray Allen and Jazz guard/forward CJ Miles.
Allen is the best three-point shooter in the NBA. That gives any team good reason to add him to their team, and the Mavericks would be smart to make a run at getting him.
Despite being 36 years old, Allen has remained surprisingly productive and would provide a scoring punch off the bench for the Mavericks. Obviously, he can shoot the three, but he can also occasionally attack the basket and play solid defense.
CJ Miles is a talented, young swingman who is solid on both the offensive and defensive end of the floor.
He's still young which means he will continue to improve, but he was a solid player off the bench for the Jazz this season. He would provide scoring off the bench as well—something the Mavericks rely on to succeed.
Either of these player would help fill the scoring vacancy left by the departure of Terry from the Mavericks and give Dallas yet another deep bench to give rest to the starters.