Depends on the injury. 300 lb guy falls on your leg/knee, it don't matter if you're 225 or 240. Other teams with US linebackers don't all go through this, so it could be S&C staff, too. Iow, speculation.
Call me a tin foil hat boi, but it's real strange that me and the whole world wondered why we thought they ruled him down, when the whistle should have been immediate.