Smoke screen. Everyone is on the table ready for a trade. DA will say these things, and expect anyone offering a weak offer to re-consider. DA ain't moving Rondo unless for superstars or great prospects/picks, and same applies to Sully.
Green has shown his ability to be the 2nd or 3rd best player. That is still considered an valuable asset, when you factor in his production and his ability to score. For under 10 million, Green is a bargain.
That is just my take though.