Give us a bit more credit. First, he was not worth a 1st round pick when they traded for him. My understanding is no other team offered that much. Just because Jerry was willing to give up a 1 for him does not mean he was worth it. This is the same logic that drafting a player in the first round make him a 1st round value.
But I get he is now $20 million per year and he does not play to that level. But who gave him $20 million? The Cowboys. He was never worth that amount either. And now, they had to trade him because they overpaid him. He is only worth a 5th round pick because Jerry criticized him after the season. Then let is out that they were going to cut him if they couldn't trade him. Everything Jerry has done since the season ended has lowered Cooper's value in a trade.
So, let's sum it up. Give up a 1st round pick when no one else would, then sign him to a new contract you knew you could not afford in 2 years, pay him more than he was ever worth, then trade him because overpaying him forced your to, then get 5th round pick because you lowered his value with your actions and by overpaying him = disappointment. I think we understand just fine.
If the Cowboys were not up against the CAP because Jerry overpaid Cooper, Zeke, Lawrence, and Dak, Cooper would still be with the team today. I am sure of it. So while Jerry blames Cooper, it is really Jerry deflecting blame from himself.