I only watched like 1 minute of his youtube clip. But, I have heard him talk about it before. I reject the notion the jerk can be done effectively without a jump just as I reject the assertion about the snatch and clean. It may/should be minimal and hard to see. But it will be there if it is a decent weight being lifted. Donald wishes not to call it a jump when the feet raise to the balls, leave the ground, and land flat- semantics, though I haven't heard him come up with another word for it. :)
Well, for not having watched the entire YouTube clip (all 4 parts), you're taking a pretty hard line in opposition to his theory.
I agree with the poster above - a great coach was not always a great lifter, and vice versa. They're two entirely different skill sets, so that's really not a relevant metric.
As to the theory of technique he's articulating, although his wording is sometimes poor, he's not suggesting that your feet never leave the ground. There's always a little "jump" - at least to the extent necessary to let the feet move to the receiving position.
His point, principally, is that trying to achieve "full" extension - that is, UP on the toes with a full shrug at the top - is counterproductive. I think his main point there is that, to the extent you're raising the bar higher at that point, you're only doing it by lifting your body higher, too, with the counterproductive result that you've now got to travel farther to bring your body back down under the bar to the receiving position.
If you look at the videos of Kakhi - he's not coming UP on the toes and engaging a full shrug at the top BEFORE starting under the bar. Essentially, as soon as he's fully upright, he's moving his feet out and racing to the bottom. The shrug is to pull himself down - not to pull the bar higher. This is also why (as I understand it) Don says you keep the shoulders "loose" (probably a poor choice of words) and do not retract the scapula at the start of the pull. That way, you're saving that last trap contraction to the end of the second pull when you use them to pull yourself down.
Just my $.02 on the interpretation of Don's theory. I'm not saying his found the Holy Grail, but his observation are borne out by examination of how winning technique has evolved over time.
mpc