Since everyone is talking about Camden Brown, and rightfully so, I'll mention Julius Wood. I loved what I saw from him. Instinctive, fast to the ball, good tackler and hits hard.
He's only listed at fourth team on the depth chart the Cowboys released, but considering how he played plus the fact I've come across several reports during camp of how good he's looking, he could be an intriguing candidate for the 53, though numbers at safety might make it tough.
As for the defense as a whole, as expected, they played pretty vanilla, but I was looking for whether they'd play their assignment well, maintain lane/gap/coverage discipline, and tackle well on first contact, all things that point to good coaching. I thought they addressed those things fairly well. Not saying there weren't issues, but at this stage, I'm just looking for how well they play the fundamentals and know their assignments as a unit, and individually, how particular guys are showing speed, instincts and making plays.