It isn't nice to say it, but the truth is that the Cowboys really need an injury to a key pass rusher on another team. That is probably the only thing that will give the Cowboys any type of leverage in a Greg Ellis trade. As it stands right now it is unlikely that a team is going to give up much to get Ellis when the Cowboys have publicly announced that Ellis won't be back next season. It seems like Jerry Jones made a big mistake but maybe when Ellis went home from OTA's Jerry was forced to be honest about what was going on.
It appears that Ellis forced the issue on the trade since he is happy to stay home from OTA's while the Cowboys try to work something out. I would have preferred to keep him in the fold at least until we see something out of the new rookies but I don't think Ellis wanted to be the insurance policy in the event that the rookies can't step up. It doesn't really matter why he is leaving but I am hoping, for the sake of the Cowboys, that a pass rusher goes down for another team so the Cowboys can get decent trade value for Ellis.