Rickson's Rubber Guard VS Zulu

I was watching Rickson vs Zulu II today and at about 12:05 Rickson goes from half guard to full guard and immediately pulls his right leg up and grabs it with his left hand. Ok, I admit, it's not exactly 'Rubber Guard' but the idea was there to control posture with the leg over the back.

http://www.youtube.com/watch?feature...;v=wKqWxmhVu28

Yea that's the hand gripping overtop the leg/foot position eddie was talking about (in the showing Rickson the RG vid) other Gracies doing. The idea of controlling posture with a grip on the leg that lead him to mission control. That and Machado's overhook clinch style game.