Faulty conclusion.....
The same can be said of every team in the NFL that isn't already at the top.
Free Agents succeed; free agents bust. Players dwindle and then explode in a new system or culture.
Ware had back issues and didn't hold up to the nature of playing 4-3 DE. He went back to 3-4 OLB, joined an even more effective pass rusher on the other side in Von Miller, was injured again, tried something new----really worked on his core more than ever in his career, and he credits that with allowing him to bend the corner better than when he was here, running wide of the QB often.
When Ware was at his best and most effective, he never had a big time pass rusher at the other OLB spot, and he never played with strong DE's who could bring it. While he was at his best, Tony Romo was at his developing worst---inconsistent, up and down, and famous around the league for the crushing poorly timed mistakes, not to mention weak OLs, receiving corps, and secondaries.
Teams at their peak bring in free agents who make vital contributions, just as our 90's teams brought in guys like James Washington and Ray Horton who excelled here after lackluster in other places. The problem isn't who we let walk; the problem is we haven't had the great success in FA or the draft in the years Romo has been at his best. Imagine if Carr had panned out to be the shutdown corner, Jenkins hadn't been an immature knucklehead, Claybourne had avoided injuries and progressed to be as projected....we'd probably have one of the best secondaries in the NFL!
What if we'd determined to draft an OL 5 years earlier? Think that would have helped Romo?
In today's NFL, you don't have to be below average in management of your player acquisition for long before it has an enormous impact, and you don't have to make but a few solid moves around your franchise QB to suddenly be a contender.
We've been trying to build a defense and an offense for too long, a miss here or there....it's a failure.
Now, we have an aging, brittle, but still talented QB, a questionable receiving corps, and solid but not spectacular RB...maybe. Yes, we need to improve the defense, but if you're not building around that OL and Romo right now with more playmakers, you're just asking for trouble that can come from one injury.