Ware doesn't have a big game in the playoffs for Dallas, then goes to Denver and has a monster playoff run and dominant super bowl. How does that not provide a clue to you?
It ain't the player. It's the organization. If Tony Romo had played elsewhere, he'd probably have a couple of rings. Instead, he spent his entire career in Dallas and is known as a guy who couldn't get it done in January.
We've seen it over and over for going on 30 years. Jason Witten, Dez Bryant, Tyron Smith, Zac Martin, Travis Frederick. There are never enough good players for this team to win. Parsons is an elite player. If there were a league-wide draft, he'd be a top 5 on every board. The 1997 Dallas Cowboys had 5 HOFers in their prime, and went 6-10, and never again got past the divisional playoffs. The Cowboys could draft the next Tom Brady, Barry Sanders, and Reggie White, and it wouldn't matter. They aren't going anywhere as long as the Jones family and their special brand of management run the show.