I see each player as a probability. The more options with talent the better the probability of getting production from the position.
IMO, the Cowboys are doing a better job of giving themselves a lot of options in recent years; whereas, in some past years they over focused on the top players at the positions and when they got injured (or quit like Ratliff) they were scrambling to find bodies to play.
LB is a good example. Instead of spending big there on 1 or 2 players, they added solid veterans that were better than minimum wage backups. There is a little extra cost paying Brinkley and Gachkar around 2M instead of the 700K minimum, but Lee is the only guy getting significant money so it evens out. They even added Rivers in FA and the signing of Watson last season seemed to be geared towards 2015. With only 2 LBs in the Nickel which was well over 50% of the snaps last season, they really have a lot of LBs. In past years they probably would have added one big dollar FA and the backups would have been a cast of guys like Cam Lawrence.
My concern this year is CB and Safety. They basically need 3 starters at CB but really only have one reliable one. I'm fine with the starting Safeties, but there is not much behind them unless you want to see more of Jeff Heath.
The other concern is the backup OT. They really seem to like Weems but at some point he has to prove himself. I'm not sure if they see Hawkins as an OT or OG. Their assessment of these guys is really critical. If they are legit options, then they'll be less likely to draft one early, but with Romo's health being the team top priority and Doug Free having 2 ankle surgeries in a 1 year time-span and now being 31, they can't afford to be wrong.
Finally, DE is not deep. Lawrence, Mincey and Hardy with Hardy currently suspended for the beginning of the season. Both the starter and primary backup at LDE from last season are gone (Selvie and Spencer). Gardner will be like having a draft pick this year, but he was not a late round pick because of injury. Jack Crawford's best game last season was at DT. Boatright and Edwards didn't play that much last season and were not really wow players in college.
IMO DT is similar to LB in that they have a lot of options. There are question about the starting 1tech, but it's a heavy rotation regardless. Josh Brent would be an ideal 1tech in the base if he gets back to his pre-wreck form. He was never in shape last season. T. McClain was never healthy last season but flashed nice ability as a 1/3 tech combo. Ken Bishop appeared better physically than Hayden but was really raw as a small college rookie. Chris Whaley was a udfa because he was injured before the draft and would be forced to redshirt is rookie year. He looks really good in game footage and likely would have been a mid round pick if not injured. Coleman is talented by goofy. If appears that Hardy might slap the goofy out of him. The Cowboys didn't really have that Star type play on the DL last year to influence guys like Coleman. Jack Crawford's best game was the 1 where he moved from DE to DT. Hardy and Mincey have both played a lot of snaps at DT in their careers.