This is such nonsense, everyone tries to sign their 2nd round picks, now, to the longer term non guaranteed version that Hinkie used. KJ didn't want to sign it, and good for him. His choice. Hinkie decided that he would trade him, given he had no way of keeping him cheap, I never fully agreed with the trade, but that's by the by. His view was (I think) giving valuable playing time to a guy he had no ability to keep wasn't worth it, esp for a 2nd tier type of player.
AK47 refused to play for them. I don't know why. Most vets there, publicly at least, say they enjoyed it.
And for the record I wonder if KJ would do it differently? He got 1319 minutes with the Sixers and 33 for the rockets that first year, and 235 minutes this whole year. If KJ had signed a multi year deal he'd be playing regular minutes and maybe have better options than be buried on the bench.
I understand why this might annoy players. Signing that deal for Covington is going to get him paid after this contract. I also understand why not signing anyone would annoy agents. I understand Hinkie wasn't a great making nice guy. He's not perfect. That's hardly the point.