From the Butterfly Guard I start from the Modified Cocoon. Instead of an overhook and an underhook I am using kind of a wrestling collar tie up where I am controlling my opponents neck and tricep.
I started doing the Cocoon this way while I was teaching the position to Patrik who has a strong wrestling background.
When I was in the Cocoon with the over & under hooks he was powering up to his feet. To stop that I turned the overhook into grabbing his tricep and later added the neck control.
From Butterfly Guard with this control it is surprisingly easy to hit the Cocoon Triangle. You must have the collar tie nice and tight.
The collar tie still allows you to hit the sweeps from the Cocoon in Mastering the Rubber Guard but it also gives you this triangle, an armbar, a real nice over the top sweep that I call Timber!, Omoplata etc...
You can also transition to the X-Guard with all of it's options.
Jason also has his head against Patrik's head and collar bone to make sure everything stays tight.
The Butterfly hooks are on Patrik's inner thigh with pressure up and outward for strong butterflies.
You have to keep a nice tight collar tie through this whole step. If you don't control his upper body and break his posture you won't be able to get your right leg in position for the Triangle.