They aren't going to do anything to help the competition. They do hold some cards here. They're going to reduce their leverage somewhat by trying to send him to his preferred destination, but they still have a trump card in that they can keep him if compensation is not up to expectations.
This is high stakes poker and I appreciate the OPs efforts. Leverage is constantly misunderstood in these situations, Adrian Peterson discussions come to mind, but Dallas is in a strong position and I think today absolutely helped.