GREEN BAY, Wis. — JC Tretter has his old job back.

Two years after he lost his job as the Green Bay Packers’ starting center because of a preseason knee injury, he was anointed as the team’s opening-day starter at the position.

The former fourth-round pick from Cornell did not play as a rookie because of an ankle injury he sustained in spring workouts. He then spent the first half of the 2014 season on the temporary injured reserve list. By the time he was activated, McCarthy felt so good about Linsley’s performance that he decided not to go back to Tretter.

Tretter admitted earlier this month that he wasn’t sure if he was just holding a place until Linsley came back.

“I think everybody comes into camp competitions, whether it’s in a true open competition, to me that doesn’t really matter because it doesn’t change what I’m going to do,” Tretter said at the time.

With two preseason games done and two more to play, let’s look at a few:

What about the pass rush?

This was the biggest question as the Cowboys left for Oxnard, and it remains so as they practice in Frisco. They do appear more stout at defensive tackle with the addition of Cedric Thornton and the health of Terrell McClain, playing alongside Tyrone Crawford. Jack Crawford has also shown the ability to rush from the interior. At defensive end, David Irving was making a push to be the starter on the left side, but he has been slowed by a groin injury. Benson Mayowa has yet to play in the preseason and has only a handful of practices under his belt because of June knee surgery. Ryan Russell, in his second season, has been given plenty of snaps but has not produced. Charles Tapper, a fourth-round pick, has missed the past two-plus weeks with a low-back strain, affecting his chances of making an impact. If there was one thing notable about the Cowboys’ time in Oxnard, it was their aggressiveness with the blitz. It’s not in Rod Marinelli’s DNA, but he might have to do more of it.

And the backup QB is …

If you said Dak Prescott at the start of training camp, then congratulations. But it’s like answering “C” for every question on a multiple-choice test — eventually you’ll be right. When Kellen Moore broke his fibula Aug. 2, the Cowboys went into search mode but were rebuffed by Nick Foles and backed off on a potential deal for Josh McCown. Since then, Prescott has performed remarkably well. After two of his poorer practices in Oxnard, he accounted for four touchdowns last Friday against Miami. The Cowboys profess they are still analyzing the position, but think about this: They went 1-11 with Brandon Weeden, Matt Cassel and Moore last season in Romo’s absence. Would a rookie backup do worse?