Cool. Thanks, Mr. Bandit.
The data seems to follow the general trend somewhat: the Bills feasted on KC, Atl, and Cle. (Atl had a bad rush D.) The Jets, Mia, and TB dealt us our worst games. (Jets had a good rush D.)
But the Bills were consistently in the 3.5 to 4.5 range week to week, more often better than worse. The strength of the run defense doesn't appear to be strongly correlated at all. So while they faced more bad run defenses than good ones, the Bills rush production was consistent regardless.
PS: The single data point for Tuel leads to the "internet statistical study" announcement that he should always be the guy handing it off.