Even if they get Jackson from Golden State, I can't see the Cavs getting past either Orlando or Boston. Orlando's still gonna abuse them in the paint, and they have enough shooters to beat them. No chance against Shard.
Boston can really spread the floor, too. With Pierce being able to step up his game and match LeBron most nights the C's can take them with relative ease, too.
So yea, Shaq's a problem in Cleveland.