The Reaper demonstrated by Jerome Basilio from 10th Planet Jiu Jitsu is basically a Go Go Plata variation from the Rubber Guard.
The things to be aware of through the whole technique are the grips. With the Rubber Guard your goal is to utilize the clinch. Everything should be tight.
As in high level jiu jitsu with a gi everything no-gi should be tight. You do not want space. The more space there is between you and your opponent, the less control you have over them.
Without control of your opponents posture when you are in your guard you risk catchin' a bad one to the chin.
