Thanks, Graeme for the feedback. I like hearing your point of view and keep a sharp eye out for your comments. Any input you have is always welcome in improving my casting and my videos.
Thanks for the vote of confidence.
It's rarely talked about and in fact I can't think of any of the great 2 hander casters who teach it, but when I watch those casters, I watch the action of the top hand. Not just the way it moves up and down, back and forward, but the angle it's taking throughout the cast and when that changes.
Why do I watch that in particular? Because in nearly every case, it's exactly the same motions as made during a good single hand cast. There's a good reason for that: the physics doesn't change just because the rod is longer. The hand still has to do the same things to make the rod translate and rotate in the correct sequence.
If we focus carefully on Gary's top hand ONLY, watching where it moves from and to, when it rotates and stops and what it does after it stops, you'll see the actions are exactly like those shown by (say) Simon Gawesworth. Simon is aiming his cast lower than Gary did, but you can see the hand and elbow movements are common to both casters.
Try it yourself: select any 2 hand caster you admire and watch what their upper hand is doing. Then find a video of a single hand caster you admire and watch them make a similar style of cast with one hand.
The difference in the 2 hander is that the bottom hand is used to make that rotation happen in a rod that is otherwise too unwieldy to handle with one hand.
When I'm using my own 2 handers, I make my casts by using my bottom hand to enable the same casting stroke I make with my single hand rods. (I probably should shoot a video to show how similar my own right-hand actions are between the two rod configurations. Soon, I promise ... )
I've actually found that when I'm teaching a person to cast a single hand rod, I can radically improve their loops if I ask them to hold the fighting butt with their other hand. It's amazing how doing that can reduce the over-rotation that a lot of casters have in their stroke.