Yes. Leonard only counts about $4.3 million against the cap until he signs a new deal. Therefore, if San Antonio signs Aldridge first, followed by Duncan and Ginobili, they can then go over the cap to retain Leonard with his Bird rights
I'm not sure if they'll be able to bring Danny Green back, though. He's going to want too much money. The Spurs could clear some room by moving Diaw and/or Splitter, but my guess is that Green is gone.