Well, I'll concede that if the C's were going to trade Ray, Kevin Martin would probably be about out as ideal of a replacement as possible. What really makes Ray fit is his ability to be a scorer without having a ton of plays run for him, but also being able to blow up when the team does run plays for him. Martin could do that too.
However, I still wouldn't mess with chemistry. If I didn't think the C's were the best team in the NBA, I wouldn't say that. But this is a team that won a very impressive 62 games and almost took out the Eastern champs without KG for 25 games + the playoffs, and basically a non-existent bench that left Pierce and Allen gassed. Simply adding a healthy KG and Powe to that equation likely would've yielded 66-68 wins and a title #18. Now, we get KG back, sign the best bench player we've had in 20 years (also solving our size problem, and bring in a competent backup SG/SF and I don't see how we can't win 70+ wins.
I don't want to mess with what could be the greatest single season in Celtics history.
Again, if I thought the C's weren't the best team in the NBA already and needed a shot in the arm, I'd be open to moves. But I don't see how you gamble on the shot we have next year.