In 2007, Cowboys Oline was ranked 10th overall (7th in pass protection; 14th in run blocking).
https://www.footballoutsiders.com/imported/ol
In 2007, the Cowboys scoring Defense was ranked 13th in scoring average given up per game (20.3 points average).
https://www.statmuse.com/nfl/ask/nfl-defensive-rankings-2007
That's not bad at all. Much better than most of the Defenses Dak has had when not injured.
Dallas Cowboys scoring Defense points per game scoring average given up by year when Dak has been healthy:
2016: 19.1 points per game average
2017: 20.8
2018: 20.3
2019: 20.1
2021: 21.1
https://www.statmuse.com/nfl/ask/nfl-defensive-rankings-2021
As you can see, only 2 out of the 5 scoring Defenses Dak has played with when healthy had better scoring Defenses than what Romo had in 2007. This means 3 of the 5 were equal or worse than what Romo had in 2007, certainly the opposite of what you stated.
I would go into the WRs and RBs comparisons, but I'm pretty sure I would be correct in my comparisons once again. Darn the internet and those pesky things called facts. lol