No its not. They were never going to keep Cooper. They did not, and still do not, have the cap space to pull it off. The ONLY way they could keep Cooper is to restructure the deal to push the cap hit off. They did not do that. So therefore they had to either trade or release and every team knew it. This is a fact and is not in dispute because the math does not lie. Cooper is, or was, making 20m per year. There are no receivers as good as him making that. The only worse receiver making close to that much is Kirk and everyone recognizes that was a stupid contract.
So bringing it back you have to trade him, which reduces his value, and he has a big contract, which reduces his value, and he has now had concerns raised about his effort on two separate teams, which greatly reduces his value. Put it all together and you are not going to get a lot for him.