Yes, and I understood that, and the point is I still think childress is a different issue than all the names you mentioned as that even with cap holds, they are unrestricted free agents, if they wanted to sign with another team the team holding their rights couldn't do anything about it, restricted free agents have a special 'tool' attached to them that ALL the names you mentioned (I'm pretty sure) don't have...so yeah,it's a different kind of thing to me
How?
You asked when was the last time a cap hold extended more than 1 year. I provided the answer.
From a cap perspective, the hold on a restricted free agent is equivalent to an unrestricted free agent.
These guys aren't being renounced because their teams can then use their bird rights to re-sign them as filler for trades. This happened twice this past year (Aaron McKie in the Gasol deal, KVH in the Kidd deal).
The reasoning to keep the cap holds is even more for restrictive free agents, because not only do you get the ability to s&t to match salary, but you also retain the ability to match. Renouncing restricted free agents would be an even dumber move for a team over the cap.
Now, if you want to ask: "When was the last time a team carried over a restricted free agents cap hold", ok, but that's not the question you asked.
Restricted free agents, 99% of the time, are guys coming off the rookie scale contracts. That's why you're not going to see many cap holds carried year to year in this situation. Most of the cap holds that teams hold onto are guys who retire, without officially signing the paperwork. There really is no precedent for a player after only 4 years in the league retiring/leaving the league. I don't believe that makes it less likely the hawks retain his cap hold/bird rights. In fact, I think it makes it more likely. There's no benefit for the Hawks to renounce his rights unless they get over the cap.