not causation. You're never going to prove that your schedule causes more injuries. It's freakin football. You can take a helmet to the hand or twist an ankle or have someone fall on your leg and bend your knee awkwardly, or whatever it is, against any opponent, not to mention in practice. Look at how often we get pre-season reports from teams saying "likely to miss opener" "out for season" "out for 6 weeks" before the season even starts. "Brutal schedule" is used an overused phrase for everything on this board.
Not to mention this argument would suggest players on MWC teams don't get injured, because they're playing in the MWC. Just one example. Derp.