Maybe the Celtics are just a better team than the Heat this year, Ray realized with Jet and AB and Rondo healthy...he wasn't going to start....PERIOD.
So what

...he can start for the Heat , but not the Celtics.
He is having trouble fading, getting old and admitting he isn't as fast or durable or good defensively as he once was. Boo Hoo ...life sucks , then you die...
His ego is bigger than his BRAIN.
So Ray , if you are still such as stud as you think , how about manning up and meeting the challenge and winning your starting spot back, instead of sulking and running off with circus.... a childish , selfish act for a team that was willing to pay you more to stay and would have embraced your winning legacy .
Not DOC 's fault.... childish behavior on RAY ALLEN