I think the Celtics need to develop the Jet-Lee chemistry, as they should be our backup 1-2 punch. Rondo and Bradley together (if healthy, of course) are just something else, you don't see that kind of defensive dominance very often.
Give Doc some time to teach Barbosa all the plays, and let Barbosa get in game shape. Then start Barbosa alongside Rondo, and let Jet/Lee blend as bench backcourt. If everything goes well, Bradley recovers completely and gets back to where he was last year, it's Barbosa the odd man out. The difficult part about this plan is Courtney Lee was brought to Boston to have a chance to start, and that won't please him. But there's no "I" in "TEAM", right?
You could tell Ainge, Doc and Barbosa's agent have contemplated this scenario, so it makes sense to start him as a way of showcasing his talents as average starter/great 6th man. Of course, I'd love to see this whole roster get their rings, but trades happen in the NBA. You better be ready and stockpile assets.