Ray just continues to move up the hall of fame pyramid. Is there any doubt that he made the best decision? I mean, seriously. I have absolutely no bad blood towards Ray. He lost his role to Avery Bradley on a mediocre .500 team that was inching very close to irrelevance. Half the fanbase wanted to trade him anyways. Boston DID trade him to Memphis, but the deal fell through. The Celtics had no loyalty to Ray... so why would he have loyalty to the Celtics? Within a year we saw KG, Paul and Doc all leave too. Ray still clearly had skills to give to a contender... so he went to a contender. So far everything he's done over the past two years in Miami has just vindicated his choice. He hit the biggest 3-pointer in playoffs history last year... this year he's a key contributor on a team that is contending for a championship. Kudos to you Ray. Thanks for helping us win a title.
The bad blood comes from people who mistakenly believed Ray bailed on a Boston contender for a "rival". It's nonsense. Our time was already over. Ray saw it before most of the fans did. The fact that we happened to meet Miami in the playoffs twice didn't really matter.
Somewhere in there is an acknowledgement that Ray Allen's legacy, insofar as he will be most remembered, will be as a sharpshooting super-role player, more Robert Horry than a teal-leading allstar (like Pierce and KG will be remembered) who had his greatest success when he filled in on contenders.
And perhaps in retrospect, he didn't "sacrifice" his game that much in 2008, either. I didn't watch him enough immediately pre-injury and trade to us to know how well he defended and could slash/turn the corner, but there is really no doubt that in terms of stardom and relative dominance at position in 2008, he was 3rd banana.
Pierce was a top SF, as evidenced by going mano-a-mano against the consensus top SF (Lebron) in the playoffs for 40+.
KG was quite possibly the top all-around PF that year as well, dominant as he still was, pre-knee injury.
Ray was coming off double ankle-surgery at the time, and his roles have fairly steadily declined since 2006, I think, while his success (in terms of team wins,and probably efficiency too) has increased fairly steadily.