I think this is one team where he's likely to embrace the role of defender, rebounder, and 5th option. The big three starters are all guys he should have no trouble playing off of, and Rondo is at a point now that a Sheed or JO defers to him anyways. He's probably not a better offensive player than Sheed - but I expect he'll do a better job staying near the hoop, play better D, and give better effort. He's only going to give you 70 games though -- but he should be able to get more rest once Perk is back anyways. Perk may not be ready to start right away, so JO could end up staying the starter.
If we can bring in Kwame too, all the better. Means we could trade one of the bigs during the season if an opportunity to improve arises.
JO / Kwame
KG / Baby
Pierce / Tony
Allen / AB
Rondo / Nate
Still need to consolidate those wing players into better talent - come on ATL give us Marvin Williams. You know you can't pay him now that you signed JJ.