Personally I think a move to bring Covelli back to Boston has a lot to recommend it. He has certain obvious platoon advantages that would help us. He is a great defensive outfielder. And he would probably be able to insert himself into the lineup on at least a platoon basis easily enough.
Against LH:
LF Crawford, CF Coco, RF Ellsbury
Against RH
LF Crawford, CF Ellsbury, RF Reddick
Unless Coco gets hot with the stick, and then he gets some starts against RHP.
With his defense and speed Coco would be a good addition to Boston's outfield, and it would represent a novel solution to the RF controversy to get a great CF and move Ellsbury over. Certainly Ellsbury has the bat to play a corner outfield position. We would still have both Reddick and Kalish to feature as potential platoon outfielders and hide Coco's bat if he needs it as well, and pushing reddick to improve his plate discipline by threatening his playing time strikes me as a good idea anyway..
Most important consideration to me though is Coco's attitude, He was a trooper when he was here, and that doesn't seem to have changed since he left, he was a good team guy in KC and again in Oakland. He was one of the glue guys in the 07 run and I think reintroducing him into the clubhouse would help. And his speed would be a useful asset on the field or off the bench, wherever he winds up playing.
In all, there's a lot of points where the signing of Coco Crisp to a 2-3 year deal with no guarantee of a starting position smells like a great idea -- assuming Coco was at all interested in signing that kind of deal.