An interesting thing to consider regarding the retirement of numbers: Historically, guys who got their numbers retired with the Celtics were usually Celtics lifers. Now, however, in the days of uber free agency and players—even great ones—often changing teams, how is this going to work? Should Shaq have his number retired in Phoenix and Orlando and Cleveland?
Ray, if he retired today, will have spent less than 1/3 of his career with Boston (5 of 18 seasons); I don't see how Boston could retire such a player's number, unless that player was instrumental in multiple championships. And would Seattle and/or Milwaukee also retire his number? What about Miami? I mean, Boston, unlike other teams, doesn't usually hand out these things so cavalierly (e.g. Miami with Tim Hardaway and Alonzo Mourning).
Robert Parish wasn't a Celtics lifer, but most people forget or don't realize he ever played for Golden State, Charlotte, and Chicago, because he spent most of his career and Boston and won three titles here. Ray, on the other hand ... we can't even make a good guess on what uniform he'll wear in the Hall of Fame.