Tony Allen bought out, Marco Belinelli in process - options for Boston?

Old friend Tony Allen has reportedly been bought out, and is soon to be joined by Marco Belinelli, per multiple reports.
Joining Joe Johnson as the early favorites to bolster a contender's deep rotation after the Chicago Bulls (Allen), Atlanta Hawks (Belinelli) and Utah Jazz (Johnson) have cut bait for different reasons, each provides veteran experience and skills which may prove vital to a team's title aspirations. 
Johnson, while no longer the offensive threat he once was, still can score effectively from the midrange, and Allen's defense could aid second units lock down the perimeter. Belinelli provides some of the best shooting likely to shake free before the first of March (the deadline for buyouts to get onto active rosters for the season), and thus may command the most attention of the three.
Should the Boston Celtics give one of these players a deal, or should they hold out in the hopes a disgruntled player forces their way onto the buyout market - one seen by many analysts as having the potential to be much more active given many teams cap constraints now and going forward? Personally, while the nostalgia of having either former Celtic (Johnson, Allen) back in green is aesthetically attractive, I think Marco is the only player who makes sense for this iteration of the Celtics, and I wouldn't offer more than a minimum to lessen the cost of cutting bait should a sexier prospect become available.

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