We had Paul Schriner one of the instructors at MGA for a seminar and he taught this series. Its become my go to escape against a tight side control when trying to shrimp and get a knee in is impossible. It works great and eliminates all that frustration.
If you control the outside arm with a 2 on 1 grip, you are safe, there is no way they can submit you from side control with only one arm. People who get really good at it, like Marcelo or Paul make you feel like having them in side control is unsafe even though you are in a dominant position, that 2 on 1 is so powerful.