Due to several reasons:
1) Kevin would not accept invitation. (I know, huge shock there)
2) They may secretly be brothers.
3) The Vegas sportsbooks took down the lines we were hoping to drive profits for charities. David was an overwhelming favorite that the books just couldn't have the big fish put any more $ on. Too big a liability.
4) I couldn't find an unbiased ref that would stop the fight before Kevin bled out.
5) Kevin's last third grade class sent me a letter asking for this event to be cancelled. They apparently liked the big lug and were worried for him.