Every NFL team will use at least two, if not three, wide receivers in each game and as such, logging a top-8 performance against a secondary is already a feat since that defense likely faced about 50 starting wideouts in a season. This is a very impressive feat and turning in the top performance is truly elite.
The top-8 fantasy performances against each defense were arrayed and each wide receivers were recorded for how often their fantasy points were in the top-8, the top-4 and highest allowed versus that specific defense last season.
Adding up those numbers yields a “better than average” (BTA) score since they are better than the average wideout that faced a defense. It also weights the performances since a No. 1 also counts as a top-4 and a top-8.