It wouldn't make it easier on Matthews to break through as a walk-on either if a teammate (allegedly) used steriods to gain an advantage.
http://www.nfl.com/combine/story?id=...s&confirm=true
http://grg51.typepad.com/steroid_nat...cushing_i.html
No positive tests though, which is really unfair to Cushing, but man, speculation on this has been rampant.