I was told it was because they are looking to re-signing some players first.
David was weighing up options for NBA with Atlanta this year as he was looking forward to the challenge of heading to the NBA, unfortunately with New management coming into the team and the task of re-signing some stars the timing was bad and David had to put things on hold.
"It was disappointing how things fell through with Atlanta this year, hopefully things will work out in the future." David said.
this is from his website.