OK, there are now 3 or more versions of the story but my analysis of the scenario where the Celtics get Marbury is that how ever unpleasant, it has to be tried. This assumes that Marbury would acknowledge a 2nd team role. He may say this to start and then morph as the season unfolds but he needs to look Danny and Doc in the eye and at least say, I accept that role. He would be great for the second unit. We need length more than offence but he still would be an upgrade so we need to capture whatever low risk upgrades we can.
Keep one other think in mind, the "Phil Jackson Rondo Defense" (PJRD). We have now seen this deployed several times and quite successfully (Kobe on Rondo but really playing free safety because Rondo still can't shoot). I love Rondo but LA has a way to exploit his glaring weakness. Marbury would need to be the counter to the PJRD as I am sure other teams have been watching. To successfully use the PJRD, you need a PG that can cover Ray Allen and a SG who is athletic enough to play free safety and still get back to Rondo when he drives. In the finals, we had only Eddie or Sam as a counter which might not be enough this year.