Greenburg has discretion in his role as CEO - but that does not mean he is the lone contributor or does not get advice. If he is found to be doing a poor job, he answers to the ARLC. It's that simple. As for why even have the discretionary power? Because crimes are not black and white. Personally, I see a significant difference between a player abusing his partner who is holding a young child and a player who drunkenly punched someone. The 11 year threshold is simply to minimise the amount of incidences where discretion is required.