I'm a pit bull here... there is nothing that Ball did that should make a person shake his/her head and say, "Yes, that kid's too good to keep off the field."
That said.
There also is nothing Josh Ball did that should make a person shake his/her head and say, "No, that kid's too bad to even imagine he could have a swing role."
I watched every play he played in preseason, and ran frame-by-frame slo-mo on the ones where his block was a major factor in the success or in the blow-up of the play called. Though I'm not a scout, I'm also not someone who is taking others' opinions and running with it based on some presumption that they know what they're talking about.
(Nate, if you're reading this, I love you as much as any Cowboy fan does... but you've made me conclude you really don't spend a lot of time studying film before offering an opinion.)
The disdain for Josh Ball has amounted to egregious unmerited over-the-top piling on, and I keep becoming more and more persuaded that there's some outright acrimony between Cowboys media and him. Virtually every player on the roster has been interviewed by some media outlet this preseason at some point... and now maybe I missed it... but to my knowledge he's the one or among the very few that haven't yet been put on audio or video. The easy interpretation would be that they're just insistent to disallow him from putting his Florida State troubles behind him, or if not that, at least that that's become his perception, which in turn, compels him to keep his distance from them.
On the field, he was impressive in this last two games. Did he give up a TFL? Yes, at LAC. Did he give up a sack? Yes, vs SEA. But as Todd Archer wrote back-when Tyron was a rookie (as Ball is, in reality), those very same words applied. Ball's not Tyron. Don't misread the point. 4th rounders deserve more scrutiny and less optimism than 1st rounders, certainly. But the point is that there's enough talent there to hold some reason for confidence that a couple of bad plays in preseason shouldn't overwhelm all he did well, or at least, average.