I think a guy who could have a big impact is Boehiem. He knows the zone as well as anyone, and therefore understands it's weaknesses, and how to attack it.
And what I think could be more interesting, is if they let him install some zone. He could assemble something fun with long athletes along his front line like Howard, Bosh, Lebron, and Brand. They could set brutal traps, and get out and close on shooters on the weakside.