big sigh
I like the idea of looking at points/drive. Unfortunately you have two unrelated variables, namely Bills offensive ppd vis a vis their season average and Bills defensive ppd vis a vis the Jaguars. You can see how that's an issue.
The right way to look at it would, clearly, be the Bills defensive ppd across their season average IN RELATION TO the Jaguars game, as you did for the offense. They averaged 1.31 ppd on average. Against the Jags as you correctly calculated their gave up 2.08. 1.31/2.08 is close enough to 1.6/2.83 as to render the distinction between which unit underperformed the other eminently up for debate.
You. Do. Not. Understand. How. To. Do. A Relatively. Simple. Statistical. Analysis