I don't see the three as similar at all. I can easily accept Guion and Jones being kept (assuming Guion was in fact not dealing). Neither did anything to directly jeopardize others. Quarless demonstrated a particularly significant stupidity and irresponsibility, if the reports are accurate as to what happened. I have no tolerance for irresponsible use of firearms.
If they keep him, I will be quite disappointed. If they release him only after R. Rodgers wins the starting spot, I will still be disappointed in the Packers. Not surprised, but disappointed.