Quickstep wrote:
"Also look at the very beginning and watch Timothy Howson do a conventional Intro and a Feather Step just as it is in the book"
Howson's feather is conventioal, but it is not even remotely consistent with the flawed theories of timing that you've posted in the past.
The video in question has 50 or 51 frames per measure, which is to say each beat is about 12.5 frames.
The timing between the steps for Howson's feather is:
Prep to step 1: 15 frames
Step 1 to step 2: 14 frames
Step 2 to step 4: 20 frames
So if we assume that like everyone else Howson is putting step 2 on beat three, then we find that:
The prep step occurs just after the "and" after beat four, on "beat 4.6" NOT ON BEAT FOUR
Step one occurs very slightly before beat two, a bit closer to it than Sinkinson's step 2.
Step three occurs right on beat three (this is what we used as our music to action reference)
Step four occurs just after the and after four, on "beat 4.6".
So, what we have is that Howson's feather's last quick is a little earlier than Sinkinson's by the numbers, but it's stil more than a half beat behind beat four!
And watching the video for appreciation of the dancing, it's immediatley notable that Howson doesn't extend his drift nearly as much on step three as Sinkinson did. I wouldn't quite call him impatient, but it doesn't have the outstanding, floating patience of Sinkinson's version.
And if we were to find someday who was actually placing that foot before the and after four... that would look very impatient, in the off-time beginner sort of way.
Another detail to be sure not to miss on this video:
See how Howson's right heel is flat on the ground on step 3 of the feather before this moving left foot breaks free from its place to even begin closing? Just as on Jonathan's video, and contradictory to your mistaken belief.
And then there's the timing of the foot rise. You have to look very, very carefully, but you can see that Howson's right heel is off the ground just before the moving left foot passes it to end step one. Another detail, performed exactly as the world's leading teachers say it should be, and in direct conflict with your imagination of how it is done.