It's a development that would have been hard to imagine back in April. He showed up out of shape to a workout for the Baltimore Ravens, and then decided to "retire" again. McClain hasn't played in the NFL since November of 2012 and he's been arrested three times. Now McClain is replacing the team's best player.
The No. 8 pick in the 2010 draft, McClain was never a consistent player for the Oakland Raiders. There's no reason to believe he'll suddenly be a quality starter now, but his ascension is one of the most surprising stories of the preseason. It probably says more about the sad state of the Cowboys' defense than it does about McClain.