Thanks MickM for your kenisiology video on body mogul alignments. There is much there at least initially over my head so will need to take a look at it more to see how it reflects my own movements. The fact a Squaw Valley mogul coach endorses it is good enough for me. I do already see some things noted I can relate to in my own skiing.
As a rec mogul skier that has never been coached or done video analysis but read a lot, interested in finding the least strenuous, smooth, efficient, moderate speed fall line fun mode skiing moguls, I've learned what works best for myself mainly by trial and error while being tuned into what feels right. Accordingly really have never understood what I am doing in depth nor can teach others though I do tend to be rather analytical about it at a modest level. I have a sloppy irregular loose though quiet upper body form that have always thought an actual mogul ski instructor would shake their head looking at haha.
As for Moseley's video, that was just a short terse tip and he would have far more to say with a higher skilled audience. The audience is obviously a bunch of ordinary skiing fans at some resort where he is making an advertised public appearance. His tip to immediately get onto the downhill ski as quickly as possible by jumping with one's whole upper body onto the top of the downhill ski is indeed part of what one does. By doing so at the optimal point compressed atop a bump, one can set that edge quickly on the other side in order to reduce acceleration dropping down the steeper downhill side of a bump. And as MickM related, a key is to keep the center of momentum following a reasonably straight sloping path down the fall line versus the up and down form of the terrain. To do so one must extend the lower body down after a bump and not allow the jumping motion to cause the upper body mass to rise out of the sloping path.
When I make continuous short dynamic turns, whether in moguls or on groomed, my mental state is one of like jumping up and down on a moving trampoline with the flex of one's skis the trampoline, much like a little kid does on a board spread between a couple of cinder blocks. That is a reason I prefer a balanced skis so I can bounce from its center without being pitched back or forward. But since the trampoline is moving down slope due to gravity, to do so while a slope is all irregular, one needs to both align the stack of body parts MickM was relating, perpendicular to the slope that is actually a falling position if static. My falling position is especially controlled by subtle movements at highest parts of my upper body, head, hands, upper chest at shoulders. What is going on in the middle of my body at the waist and lower back is what I've never understood well and rather just seek a relaxed upper body feel. And that is where I often get into trouble because once into a rhythm after going long distances down a field, may start day dreaming while having little focus or clue of what is going on below haha and suddenly make a single forced awkward turn then bail to a stop.