Whether the Celtics retire Ray's number or not, should not be such a contentious thing for so many people. If the Celts retire his number, why be upset by that? Let Ray enjoy that moment for what he did while he was here. If you are happy for his number being retired, cheer him. If you are not, shrug your shoulders and move on.
Regardless of how you feel about his number, I don't think anyone can deny what Ray did for the Celtics while he was here, or the individual milestones he reached while he was here. Pretending like Ray was merely a third fiddle on our team would be like calling DJ a 4th fiddle. On top of that, if that Ray trade does not happen, that KG trade does not happen, and #18 does not happen the way it did.
And to say this team did no meet expectations is absurd. The team had a three year window by all accounts, and won it in their first year. Went to a game 7 in another finals, and went to a game 7 in a conference finals all after KG and others got injured. And I am pretty sure Ray had many more big shots than choke moments while he was with us. During that last run, Ray played through bone spurs the last half of the season. Also, no one can deny that after Ray left, the team was just different. The spacing he brought was priceless.
I think it is totally fine to hate on Ray for leaving the Celts for our rival while we were still trying to contend, but at some point, you even have to move on from that seeing how things have played out for the Celts since. Retire his number, don't retire his number, let the Celtics decide. But to deny what Ray did for us while he was here, that's just sour grapes.