And I'd wager that within a reasonable version of "launching pad" it won't be.
He won a weak, limited-field event. I'm sure it feels great - it's one event every FOUR years instead of majors which are four events every year (usually). But it's not even as good as winning a WGC event or the Masters or something (also limited field events) as an actual achievement.
I'd be willing to wager that simply because:
There are a lot of other good golfers out there.
He hasn't done it yet, and for "this" to be the catalyst, he'd have to do it within the next year or so for this to be the "launching pad." Who cares if he, like Sergio, wins a major 15 years later? The 1999 PGA was not the launching pad for Sergio's Masters win. Nor were any of the Ryder Cups in which he played so well, etc.
Make some swings in a mirror and try different things. See what your feels produce.
I don't really know what you mean by "using your knees" in this way, and quite honestly, I don't think you do either… not because you don't think you know, but because you're probably not doing what it feels like you're doing.
Move the hips properly, and see what the other body parts do. Do it in a mirror so the feedback is immediate.