http://nba-point-forward.si.com/2011/12/01/even-the-league-is-unsure-of-amnesty/#?sct=nba_bf2_a4
Interesting stuff, if in the end you're only allowed to use the amnesty rule on currently signed contracts then the Celtics after this year will only have two amnesty options, Rondo and Pierce.
Lots of things to still be worked out in the next two weeks between the NBA and the NBAPA.
My only question is, could you waive a player and then re-sign him if no one bid on him? Could the Celtics say for example waive Garnett with the understanding that he would be brought back at the minimum in order to free up cap space this off season?
Most likely not.
First, the other times the NBA has done amnesty, they have not allowed that loophole.
Second, there is the "bid" process on claiming waived amnesty players off of waivers, which you referenced. Teams with cap room can bid on amounts they'd like to pay the amnestied player, and he would be bound to go there.
Let's say that Minnesota bid $2 million on KG. He'd be awarded to the Twolves, and they'd be on the hook for that amount of salary, while we paid the rest of the contract KG was owed.
I don't think there's any way that KG, Ray, or Pierce would get through the bid process without being picked up by another team.