On the front page of today’s Dallas Morning News, sources say the Dallas Cowboys may abandon their practice facility in Valley Ranch for greener pastures in Frisco or Arlington. Irving, the Cowboys’ home for more than 25 years, is also in the mix. But the story says nothing about Dallas. Come on, Mayor Rawlings. You want to Grow South? Get America’s Team back in Big D. Personally, I find the concept of the Cowboys neither practicing nor playing in Dallas County offensive — and that’s coming from a lifelong Philadelphia Eagles fan.