Bleacher Reports in “Re-Ranking Eastern Conference Contenders Following Gordon Hayward Injury“ puts more significance in Hayward's injury than any one result of opening night. The Phoenix Suns, more than any other team, should be depressed after their first game. In the article the Miami Heat are one of only six contenders, including the Boston Celtics, for a top-four slot.
Rest assured they[Celtics] still remain one of the six teams with a legitimate shot at ascending into the conference's top four and holding down homecourt advantage in the postseason's opening round.
I suppose in his summary of the Heat's chances, by quality teams he means the Golden State Warriors and Celtics, among others.