For the past two days the media have been wondering why no one double teams Gilbert Arenas when he has the ball. So the Knicks tried it last night to great effect. Agent Zero was held to 16 points on 4-14 shooting, but got the ball in the hands of his teammates consistently, which enabled the Wizards to take down the Knicks 99-98. Yes, it was another wild finish at the Verizon Center last…