This is great, thanks for posting.
I thought this was especially interesting:
I've never thought it through in much detail, but this must be the sort of stuff that factors into a team really liking or not liking young players coming up. If Romo says, for example, that a safety is really good at disguising a coverage in practice, that's going to mean something positive, whereas if he's consistently able to read him. And that level of information is available coming out of camp for all of the defensive players. What Dez thinks about beating a guy off the break, or whatnot. There's actually a fair about of information available there that's not going to come out in preseason games.
And, for the people who hate on Matt Johnson's skills for no particular reason, this isn't a defense of any player in any way (the article says nothing about what the players might think, either way). It's just a comment on how the team obviously acquires some of the data they use to evaluate players and more explanation of the obvious case that they know a lot more about these guys coming out of camp than we fans do.