As crazy and far-fetched as it sounds, the Dallas Cowboys are still very much alive in the NFC East race from a mathematical standpoint. From a realistic standpoint, it's a little bit different now that Tony Romo is out for the season and the Cowboys are 0-7 in games he doesn't play in.
Matt Cassel is the projected starter for the rest of the season now, and while he's a veteran who has won games in the NFL before, he has yet to win a game for the Cowboys yet. That leaves practice squad QB Kellen Moore, who was great in college at Boise State and was in Detroit with Cowboys offensive coordinator Scott Linehan for a few years, but he's never made an NFL start.
With the Cowboys needing to play for the future very soon at quarterback given Romo's age and injury history, it would make sense to see if they have anything in Moore, and more likely to draft someone no later than the 2017 draft with a high pick.
The Cowboys can't throw Moore in there yet because, as much as we don't want to believe it, the Cowboys are still very much in the thick of the NFC (L)East race. Cassel gives the Cowboys a better chance to win than Moore does, most likely, and they're still in the business of winning.
Once the Cowboys are eliminated, which at this point, might be a while, then you can see what you have in Moore.