Cowboys have been pretty good in turning around players whose reputation for not contributing much/working hard has been questioned. You cite Jay Novacek was one of those who improved after leaving the Cards for the Cowboys; went to pro bowl with us. Obviously Leonard "Bigg" Davis is also another one; went to pro bowl with us. But how about WR Terry Glenn who Pats sent to the Packers (and after one year with them) the Packers turned around and traded him to the Cowboys for a 6th rounder. Seattle didn't resign Hamlin (maybe questions long term about his head injury?) so Cowboys signed him; went to the pro bowl with us. Biggest example is Terrell Owens who Eagles couldn't wait get rid; he became our best WR & went to the pro bowl.
I'm sure there players we got that didn't improve but can't remember them because they probalby already gone. But if the Cowboys do "due diligence" , changing teams/city can revitalize the player's career. Jones, as a former Arkansas player, would be somebody Jerry could find out a lot about. If Cowboys wanted him, I'd wait til he was a FA. OTOH, Jerry gets good info from Arkansas people & good vibes re Jones (do we have anybody on our team //players or coaches// who worked/play in Jax & can give us the skinny? In any case I wouldn't give up anything more then a conditional 7th rounder based on his contribution in 08.