Percy, first, don't say "significant difference" - that has a specific statistical meaning and you aren't using the phrase correctly. Second, the statistics you presented have no bearing on predicting wins or as DMyers highlights, points. Third, and a bit more troubling is that the values you present confound defensive play with offensive performance. How a defense plays has zero bearing on how we evaluate a QB's performance. For example, Chicago was a terrible passing team -- bottom quarter of the league, yet given your passing "statistics" they are top ten. Obviously they are top 10 because they have a tough D to pass against. Fourth, you still haven't put the statistics to "practical use" -- practical use is predicting wins, not predicting some sort of newly made up ranking.