I would think Lynn could add a ton to this, considering (from memory) I believe he followed Trevino at the Masters (not to mention being an historian) - and, I am sure, studied his swing...
Lynn?
Yoda?
Hello?
I'm not the omnipotent and omniscient green guy, but I'll give you my 2 cents.
I use all 4 barrels for max power. I use the Swinger's Start Down but Load the Right Elbow in preparation for Drive Loading. As I Load the Right Elbow so late, it certainly looks to be a Float. It's important to Delay the Trigger as long as possible, but it becomes more difficult to control the Clubface as you approach Pitch Elbow/Snap Release. Release too soon, and you'll find those 300 yard drives few and far between.