I've never had the privilege of sitting in on an weekly NFL gameplan meeting, but isn't it pretty common knowledge that coaches use scouting to research existing lingering type injuries of their opponents?
And use those reports in the gameplan?
I'm not talking about trying to end careers, but if an opposing player is playing with a bruised rib...i'm telling my guys to hit him high. If an opposing player is recovering from a ankle sprain...i'm telling my guys to hit him low.
I just assume this type of thing goes on every week.