If the Cowboys are to have any chance of going deep into the playoffs with the core players they have, they must do well with this draft. They've been 8-8 the past 3 years and aren't' that far away from making the playoffs. A better defense is all that's needed. They are just a good draft away. Based on Jerry's past performances at drafting, I don't have much hope of that happening, but a blind squirrel can find a nut from time to time. And if he trades up to take Manziel, then he's just after the jersey sales proceeds.
It's not impossible for the defense to be much improved from last season with just the existing players on the roster if everybody stays healthy.
Stability of having the same player that were in training camp playing in the game would be a huge boost.
There are several 2nd year players that got experience like Wilcox and Holloman.
There are many players coming back from injury like Lee, Crawford, Bass and several other that were in and out with injuries like Claiborne and Carter.
Having Lee for the entire season would probably be better than the version of Ware that played in 2013; therefore, in terms of star players they could be in better shape if Lee can make it though the season.
The new additions like Mincey and McClain might be blue collar types, but they are legit NFL players, unlike many of the 17+ DL that were cycled through last season.