How about this new version:
J. O'Neal / Gray / Kwame Brown
KG / Big baby / Troy Murphy / JuJuan Johnson
Pierce / Jeff Green / Gilbert Brown
Ray / Marquis / Wafer
Rondo / West / Bradley
I like the idea of bringing Marquis back, and I also would love to bring Semih back. I want Delonte back, no doubt.
I think Moore will be with the team when the lockout ends, I don't know about this kid Gilbert Brown. I think Marquis would be a 3rd option at the 2 and the 3, while Moore and/or Brown will be with the Rock Lobsters. Bringing back Wafer is ok, but maybe they could get some veteran help for the min or the LLE(if there is one), someone like Redd or McGrady.
The big problem is the PF and C spots. It's unlikely that BBD is coming back in green. Like Rondo says, Baby's doing what's best for Baby. So if a S&T will allow Baby to get more money, the Celtics should try to get some player in return who wants to be a role player around the big 4. Landry or Thompson would be great, but just like Baby, would not solve the lack of a C. IMO, if the Celtics can get Baby's replacement without using the MLE(if there's one), then they should go after D'Alembert, or more likely, after Kwame.
If the Celtics had Kwame and Semih (Gray or Ajinca instead of Semih would be fine, too) behind JO, I think Baby or his replacement plus JaJuan would manage quite well the minutes behind KG.
Hope there's a season, and the Celtics roster looks like the one you are proposing.