MVMac, you wrote, "~~I think "knuckles down" can be a useful feel but being concerned with the club face "closing" can send the clubhead low and LEFT. End up hitting pull cuts. If you mean closed to the path, that's fine, if you mean closed to the target, that could be an issue."
It's funny, I absolutely love DK's video where he talks about the issue of swinging, "low and left". He illustrates the move and says, in "golf instruction, it's referred to as being 'over the top', who cares what it's called, don't do it". Then he illustrates how to release the club correctly to create the correct swing path to the PowerPoint.
I am not sure why you are going back to my comment about curling the toe. That is an observation of what happens when you hammer down with your left hand. I am not sure what "closed to the target" even means (I do really) it's just irrelevant to any conversation in golf unless you think you can actually hit a "straight" shot" I don't believe that straight shots exist (even if you did get a perfect 90 degree rotation on the ball wind will push the ball left or right... so it's nonsense to talk about a straight shot.
Here is my simple procedure to line-up and hit the shot of choice (by the way, this is the exact process I have used to get my 5-7 year old kids to learn how to curve the ball right or left.
1. Stand behind the ball and picture a line from my ball to the target (the target line). This line is useful only to select your intermediate target and to choose a ball flight. Then it should never be considered again.
2. Decide which flight you want to see (draw/fade, high/low). Based on the shot shape you want, select an intermediate target on the ground (right or left of the target line). This represents the swing path and it represents where I want the ball to start (my PowerPoint).
3. I select the correct club/grip relationship to match the flight I want to see. I will explain more momentarily, but at the beginning you need to have your hands on the club so that your grip, clubfaces relationship will dynamically create the ball flight you want.
4. Hammer down on the swing path line... the hammer motion will cause the toe to curl so that as you make your pivot the toe of the club will hit your PowerPoint (the spot that is on your swing path and is low to the ground). Here is the key, hammer down to your right in such a way that the club swings to the intermediate target/PowerPoint as you make your pivot. The entire backswing and downswing is focused on one thing, hammer down so that as you turn, the toe of the club will hit the PowerPoint. (when you hammer down and make a pivot... viola, you are making a golf swing). There is no need to swing up to a finish... that happens because momentum takes you to that finish all of your focus, all of your effort is simply hammer down and let the pivot bring the club to the ball.
The tricky part of this procedure is understanding your personal club/grip relationship to allow the flight you want. For me, if I take the club and place the bottom line of the club on the face of a clock... picture the bottom line pointing in line with 12 o'clock (90 degree turn has the bottom line pointing toward 9 o'clock). I turn the clubfaces to between 10/11. I place my thumb right down the top of the shaft and then rotate my forearm so the face appears square. That is my strong draw grip. I point the face at 11 (then regrip) for a baby draw. I point between 11/12 (then regrip) for a baby fade. For everyone I would expect this club grip relationship might be different... it takes some experimentation for each person. However, once you understand that you are swinging to a PowerPoint and the club/grip relationship you take at the beginning will determine the ball flight... then it can not get any easier. Once you understand this simple process, you can start trusting that the ball will do what you want and you can forget about all of the crap about the golf swing. Instead, hit a PowerPoint with the club/grip relationship that you need for the shot you want to see.
This methodology is completely consistent with DK's teaching (I believe). . and it really works. Now it's funny to me how much I have read and thought about the mechanics of the golf swing. I personally wish I had started with something as simple as Klassen's stuff because it would have saved a long time of frustration. The swing is irrelevant. Getting the correct swing path matched up with the grip/clubface relationship and swinging to the PowerPoint... that is it.
If you want or need something more then DK won't be the guy for you. If you want to keep it simple and hit shots to a target with the shape you want... maybe it's worth considering.
For what it's worth, I find a great overlap with Darrell Klassen and Shawn Clement. SC is very focused on a release to the target... which I interpret as a release to the PowerPoint. . maybe worth another thread.