There was a qualifying offer from the Spurs for $1.6M. That's how a player gets to be restricted. I could go pull the news stories on it, but really.
If another team had made him an offer, it would have had to be in the form of an offer sheet, and the Spurs would have had the right to match. That's how RFA works. None were ever reported. Many teams are reluctant to screw with restricted agents, because of the likelihood of getting their offer matched. In the early part of that FA period, players were being snatched up quickly. A team couldn't afford to waste the days, waiting to see if their offer would be matched. That much is just simple free agency mechanics.
The Spurs didn't do anything wrong, and I never said they did - no matter how much some people want to twist my words. I said I didn't like the way they handled it. I don't like asparagus, and I don't like cats. But I don't equate the two.
Hope that clears everything up, cuz I'm really tired of the subject.