For the Dallas Cowboys, nobody is challenging Dak Prescott for his starting spot anytime soon. And guys like CeeDee Lamb, George Pickens, Tyler Smith, Micah Parsons, and quite a few others on the team will work hard in camp, but will not be competing for their starting spot.
But there are starting jobs on the team where a starter - while currently penciled in on the depth chart - may not have a very firm grip on his starting spot. Most of those contested spots can be found on defense, where there are quite a few spots that should see some heavy competition in training camp.