Gramted, I can only imagine what Orlando would try to hold Ainge up for in a sign-n-trade. They'd almost certainly want a 1st rounder, which Boston shouldn't give up. And granted, Barnes isn't anywhere near the scorer that Howard is when healthy. But with Howard coming off a major knee injury and Barnes probably being a more pesky defender who apparently has fewer suitors and might be more willing to take a 2 year deal, shouldn't Ainge at least see if something is possible.
mike