flamingrey
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They should simply take out any TD's given up by way of returns (Int/punt/fumble/kickoff). In addition, maybe take the average yards gained in a single drive (example ave. offensive drive is 20 yards before having to punt or something). From that they can derrive whether a defense should have been expected to give up any points after their offense turns the ball over. So, if a team turns the ball over on the opponents 48 yard line...the average drive being 20 yards (for this argument) that wouuld put the defense back at the 38 yard line, and potentially giving up a FG, but they would have still have held the opposing offense to the average amount (or less) of yards expected. So, in this case, the FG wouldn't count against their PPG average just like the returns wouldn't.
Hopefully that makes some sense....hard to type it out the way I am thinking it up.
Some good ideas in there (same as Crash's post).
You'd also somehow have to account for average starting position for a normal drive (one that doesn't initiate from a TO). On average, is the defense starting from the 20 yard line, the 30 yard line, etc. So it gives a measure of how many yards were possible to even give up before a FG or TD. Take 2 teams that both defend 10 drives and give up 10 TD, while both may seem "equal", if one team starts from the 30 yard line and the other 20 yard line on average, the team that starts on the 20 is actually worse than the 30.
For drives that ARE initiated from TO, they would similarly have to have a 2nd set of average starting positions. Depending on where the team starts on the field has a bearing how well that defense is going to do. As the field behind the defense gets shorter, it becomes easier to defend. So if one defense starts at the opponents 20 yard line versus a 2nd defense at the 40 yard line (both essentially in FG range), it's easier for the 1st defense to go 3 downs and a FG than it is for the 2nd defense to go 3 downs and a FG. Total yards, number of first downs, completions, etc. given up are all impacted.
To go on a tangent, this is why I'm not a big fan (I actually hate it) of the current QB rating that is widely used. Way too simplistic, arbitrary (looking at the "multipliers" in the formula), and doesn't account for the plethora of variables that go into determining a QB's play.