I saw him too (maybe I'm one of the three?) and I have always taken the position that Willie did use a small slip stroke. However, I respect your opinion and Lou's and also I just got tired of arguing about it. Whether it's a slip stroke or merely repositioning his hand before the final back stroke, it is what it is and it sure worked for him.
I can say this with a fair amount of certainty - on all shots that he hit with authority he did it. In his 1980 video (the one where he runs two racks at the end) he's miked up. On most shots you can't see what he does with the hand because of camera position but I swear you can hear it - you can hear the sliding of his hand. I don't think it's my imagination. Now, in straight pool the way Willie played it most of the shots are short easy ones. I'm not saying he used it where he was just tapping the ball. But when he used a medium stroke or harder, you either see or hear the slip.
As I'm sure you do, I wish I could go back in time and see those exhibitions again. At DCC in the straight pool room you can sit so close to somebody running 100 balls that you worry you're crowding them. At Willie's exhibitions I was far away and in one was standing surrounded by giants (so it seemed - I'm vertically challenged, the one thing Willie and I have in common). I did watch his stroke as best I could and I didn't notice any slip then - the thing I noticed was that his wrist opened a lot on the final backstroke. My guess is that he was doing the same then that I've seen on later videos - the slip or repositioning, just a couple of inches.
I assume you are refering to his instructional video. I'm with alist
on this one. No one disputes that he moves his hand, it just isn't part
of the stroke.
Now back to the original point of JoeyA's thread.
If you slo-mo thru his break shots, you will see that he brings his elbow
so far down on his follow thru, that he actually has to push the cue
out away from his body to avoid bumping into it with his elbow.
That's right folks - he drops his elbow so far it ends up BELOW
the line of his cue.
FWIW - I have a video of Mez doing nearly the same thing - his elbow
is down by his beltline at the end of his stroke.
FWIW Part II - the late, legendary player, George Rood dropped his
elbow on nearly every shot. Granted, he was well past his prime by the
time I ever saw him play - but he had run 75 the previous week,
he was 79 at the time.
So maybe the, ahem, 'instructors' can cease preaching that dropping
the elbow is unorthodox.
Dale<who has been known to drop an elbow or two>