David James this morning on 1280 talked about how NBA deals get done. Because the "Moritorium" and tampering rules are easily sidestepped and never enforced some teams are recruiting players all time. Consequently many of the decisions are made weeks, or months before the July FA period. For example Durrant had decided to go to GS long before he dogged three playoff games to let them advance in the play-offs.
According to James, some people in Boston believe Gordon decided to go to boston last summer. Some people believe he decided earlier this year.
James also talked about Dennis O'Lindsey having multiple plans in place to move on if Hayward leaves.
What DJ didn't say, but should have, is the fans are the unfortunate and unwitting victims here, everyone else knows what is going on but maintain the illusion of playing by the rules.