To answer question number 1. I think the answer is no, not really. In fact, I could argue there is a good chance both the OL and DL will be weaker this year. After all, Tyron and Zack are a year older. Steele is not as good as Collins. We have no idea how Tyler Smith will play. They are depending on Tyler Smith, a rookie, to produce at a new position right away. They are depending on Steele to improve again. They are depending on Tyron Smith to get healthy and stay healthy and at the same time turn back the clock. Could they be better in 2022? Yes, they could, but chances are they will not be.
On the DL, they have essentially the same players except Randy Gregory and his 30 QB pressures. They need veteran Donte Fowler to find himself or Dorance Armstrong to have the best year of his career. Or, the need a rookie, Sam Williams, to come in and make an instant impact. This is counting on a lot and the reality will be something less. Then, they need the young DTs to make a huge leap with one more year of experience. It could happen, but I do not expect miracles. I hear a lot about Ridgeway, a 5th round pick, but depending on him to make a big difference is desperation. Finally, we get to Lawrence. Lawrence has missed significant playing time in 3 of his 7 years as a Cowboys. Last year he missed 10 games. He did play all 16 games the prior 3 seasons but he has struggled with back problems. I would not say he is as fragile as Tyron Smith, but he has had his share of injuries. And after 7 years, what we see is what we will get from him. He is not even as good as Greg Ellis. Lawrence averages just over 6 sacks per year. Ellis averaged just over 7 in his 12 years and had over 7 sacks in 7 of his last 8 years. He played 9 games in 2006 and had 4.5 sacks.
Again, the Cowboys did nothing to bolster the DL and are depending on everyone playing better. This is a risky proposition.
Defense is a team effort. If they depend on Micah Parsons to carry the defense it will not work. He is their best player by far, but offenses can neutralize 1 player as SF did with Parsons. That's when the rest of the team has to fill the gap.
I have never felt that relying on the same players will give a better result. The Cowboys chose to sit out free agency again and I think it is going to show.
As for question #2, this offense has no playmakers and that has been their problem. I won't say Pollard is because he doesn't even start. CeeDee has to prove he is that guy, but first he has to stop dropping the football. Zeke has not been a playmaker since his rookie year. The closest thing to a playmaker on the offense is Gallup who has made some huge catches over his short career but he is not consistent enough.