Top 30 Total D is based on yds. 400 yds/GM won't have you Top 30, but only giving up 17-21points/gm is still great defense. Top 30 scoring would be better for us imo
I think TOP/death marches are overrated too. Too many have hitched their wagon to the CPJ Death March. Our big play ability has the same impact as 15 play drive on the opponent.
TO Margin is huge, being over 50% on 3rd down has been great to us, 1st down offense/defense
You gotta math that junk. As AE87 states above, ppd (points per drive) and ypp (yards per play) are the superior stats for measuring the strength of a defense. It takes out many other conflating factors like TOP, bad offenses, turnovers, field position, etc. Of course one also would be best served by factoring in the strengths of the opposing offenses to tell the most accurate tale, but that is a more difficult challenge to get right.
Being top 30 in ppd and/or ypp is an extremely significant stat, whether measuring offense or defense.
Turnover margin is obviously important too. But, a great defense can even make that stat less significant. If you're a great defense, you may not get any turnovers, but if you also don't allow any points, then you're going to win. So, winning/losing the turnover margin isn't as significant if your defense is stout. For our defense the last several years, turnover margin is a huge factor because that's been one of our best ways we could get stops.