Did Trevino just describe Stack & Tilt?

No. What makes you say that? 80% of your weight staying left? In S&T; it's not even above 55%.

Middle of your stance is pretty standard ball position with a wedge for any swing.

Few things.  Trevino isn't doing exactly what he's feeling with regards to the weight.  It's a centered pivot, head stays very steady and the left shoulder moves down and back.  He's demonstrating a different kind of pattern for flighting the ball med-low, useful for wedges and something you could do with equipment from that time.  S&T; pattern is designed to hit high draws.  High draws patterns will tend to have a relatively shallow angle of attack.  Good example would be Tom Lehman, not a "S&T; swing" but a high draw player.

And I was asking what made you ask. :) Just the "80% weight forward" bit? Which is way more than S&T; want?

Or was there something else? :)

The reason why I asked why you asked is because I was curious if that was still your perception of S&T.; It appears to be that your perception is "75-80% weight forward and stays there," which means that they aren't getting their message out very well. :)

And as you probably know, we've moved well beyond the S&T; swing, but for a lot of people it's still a pattern and a swing worth a little study because it's fairly simple to understand quickly (as every single-swing method tends to be).

Also note that Lee could beat down on the ball a bit more than most without hitting draws because his baseline (and his stance) was rotated so far left that it was almost impossible for him to hit a draw or a hook.

While S&T; is good, and most golfers could stand to incorporate some S&T; components to improve, for two+ years now we've moved beyond S&T; as it is limiting (as all single-swing patterns or methods will end up being) in both its approach and scope. We'll still teach S&T; to those who request it, and while we've never really "taught" S&T; exclusively, we've taught it a LOT less the past two+ years. You came to our 5 Simple Keys® free lesson day, and you've been on this site, so I'm surprised you haven't picked up on this. We take our name ("Golf Evolution") seriously and are constantly exploring better ways to instruct, more accurate information, and so on.

"Moved beyond" meaning S&T; is a pattern, a way to swing a golf club. I feel some S&T; instructors can get too caught up in certain positions and don't think conceptually about the information.  5SK is a system of prioritization.  Jim Furyk and Matt Kuchar hit different positions but both do all 5 Keys, most of the time ;-)

That and continuing to do research, using the latest technology available to keep learning/busting myths

No, I can't speak for whatever other people are doing. Just me, often Golf Evolution, and rarely but sometimes 5 Simple Keys® instructors.

I know you're not a pro. I'm just surprised that you haven't picked up on some things by hanging out here. Unless you hate S&T;, I'm under the impression most people will gather some things from all that we've written about it. Maybe you've not ventured into the "technique/instruction" threads as often as most people tend to.

Yes. We can teach more people better with 5SK than we can trying to teach S&T.; And to be perfectly blunt, even when if you had asked us if we were teaching S&T; and we'd replied in the affirmative, you'd discover we hadn't been teaching it precisely the way it's built. As soon as we understood it (really doesn't take long), we'd begun modifying pieces of it to better suit the variety of golfers out there.

Single patterns - methods, or "one way" of doing something - are inherently inflexible. As Mike said, 5SK encompasses all of the best golfers, and helps all of the less skilled players get better.