No, it's the exact opposite. The DL rotates but DBs and LBs don't really sub at all.
Woods, specifically, has played every single defensive snap this year.
https://www.pro-football-reference.com/players/W/WoodXa00.htm
Sure, DBs sub less than LBs, who sub less than DLinemen. But it is still more common than what is seen on offense.
So while you are absolutely correct that this year Woods has played 100% of the snaps. Previous years it was 91% or less. So let's look at a couple of safeties that Cowboys fans want(ed) and/or have mentioned recently:
- Earl Thomas, he has never played 100% of the defensive snaps. When healthy, he was going at 96%+, but never 100%
- Jamal Adams played 98% and 100% his first two years, but since then, he has not topped 87%
- Juan Thornhill played 89% his rookie year and is at 91% so far this year, so he will not top 100% in his first two seasons
- Jeff Heath topped out at 98% and 84% in 2018 and 2017, every other year has been 61% or WAY less.
- Hell, he is only on the defensive side 13% of the time for the Raiders so far
Now on to a couple of linebackers Cowboys fans tend to talk about a lot:
- Darius Leonard has topped out at 91% of D snaps his rookie year, only hit 80% his 2nd year, and is on an 82% pace so far this year
- TJ Watt looks to be a mid 80% guy with 77%, 86%, 87% and 84% of D snaps throughout his career
Oh ... but 95% is still a lot, right? Well if a Defense plays a flat 1,000 snaps in a season, which would be very low for any D in any year (62.5 defensive plays per game), that still means the player stat for 50 defensive snaps. And 95% is still arguably very high for most non-dline defensive players.
Therefore I believe it is safe to say that while it is more common for Safeties and LBs to play a higher percentage of snaps than defensive linemen, playing 100% of the snaps for ANY player on D is an EXCEPTION rather than the rule.