Valid point.
I know Sal M's been beating that drum for a long time (along with many here), and tying it to the injury situation -- 250-lb DEs and 220-lb LBs just don't hold up against the behemoths on most OLs these days. Hard to argue against that point.
In fact, I just pulled some IR numbers in response to a question posted on Tim's Facebook page. (Another one gone today, 21 for the season.) During 2002-03, Rusty Jones' final two years here, the Bills placed six players on IR each season. What percentage of that was his influence, and how much was the different defensive scheme (in particular, sturdier LBs like Fletcher and Spikes)?
I wonder ...