: Some time, like a ConnYak picnic, you will have to show me where
: Greg was wrong in his presentation.

Well, I wouldn't say he was wrong, because whatever works for you is right for you, but he was not demonstrating the current thinking as I understand it in the following areas:
1. Arms too stiff. Danger, Will Robinson
2. Too much torso rotation early in the stroke, before the paddle blade is buried in the water - he's using up half his rotation while the paddle is in the air. Better to plant the blade with the arms, then rotate.
3. Too much crossing the body with the arms - stroke is being powered too much by shoulders and not enough by torso.
4. Top arm too low - paddle angled like a front slash (/) through the power phase. This will make the boat unstable because it's hard to generate support with the paddle angled like that, and it's inefficient because you're lifting water.
5. Late exit. Paddle is way too far back when he exits the water - providing neither support nor forward force in that position.