This is one of my favorite butterfly guard sweeps. This sweep is from a position where you do not have under hooks or over hooks yet. The cross collar grip is important in this sweep because you use it to help you finish as well as get to the knee on belly position. You really can control the end of the sleeve, the elbow part of the sleeve or actually cupping the elbow on the opposite side from from the cross collar grip. In IBJJF rules, this would be four points if you landed in the knee on belly position two for the sweep, two for the knee on belly.