Agree with
@ScotsSkier. We've discussed this a fair amount here, though not in the Ski School forum. More in the context of what makes her dominate in SL, and to some degree why have her winning margins come down.
I get my info from two of her former coaches, and two others who spend about 20 days on snow working with her. SS nails it. She gets into the fall line sooner than anybody, and says in it longer. Couple that with having probably the most effortless, yet fastest switch in the business. And add to it that she tends to always be just perfect in terms of how much she is on edge. She is almost never "grinding" and some of her key completion is. A few races last year where MS won big runs over somebody like ZuZu, who was real hard and dug in on the bottom flats.
MS's fitness is also trenendous, so she executes pretty perfect from the start through the finish line.
One of the real challenges in having her move into skiing every GS, and more SG...according to people close to it...is that it's fundamentally very different. So when she was almost entirely focused on SL, and when the had her setup dialed in, the margins were insane. Start training more GS, and even SG, and the movements differ. Some think even switching to her GS and SG boots is a factor. I'm not thinking that part is huge. She only skis on her SL boots with SL skis.
As it's been explained to me, skiing the other disciplines generally involves more time across the hill and out of the fall line, and the timing is such that while she still may have the fastest switch going, she just can't use it to as big an advantage.
Last point. Her muscle memory is off the charts. I have no idea if one can measure it, or quantify it. She has done more drills, and continues to, than anybody in the sport. She loves it. She loves freaking with a specific purpose, most often with her mother and coaches. She has been following this rountine for about 15 years.
She is the type who would pass up a powder day to sleep in, and would wait to have Gold Peak at Vail groomed, and then would do her drilling and skiing. I had assumed when she was about 15-16 that she had some supernatural sense of touch. Nope. That's not it. She has amazing control over her body and movements, and can make such subtle changes.
She is used as an example by hundreds of coaches, as her technique, particularly in SL, results in her pulling time on the field on every direction change. Say it's a tenth of a second. That is what has created some of those huge margins. Or so her coaches say.
One interesting anecdote. Her real guru is Kirk Dwyer, the former head of Burke Mountain Academy. KD is now the Exec Director at Ski Club Vail. He is changing their programming, particularly as U-14s and more so as U16's so that SL is going to be the fundamental base of their skiing. All built off SL, and increasing the relative percentage of SL skiing. Much less speed skiing. Some say close to none. A bit less GS than SL. BTW, they are going to train less, rest more, and race lest. With a goal of producing very, very fast FIS level skis.
Clearly he feels that SL is critical. My take is that he feels it develops the body awareness and muscle memory. A hunch.
But yeah. Fall line, fast switch, perfect edge angle, no digging in a grinding. To keep it simple.
Pretty sure that when she retires, her free skiing will look like her GS skiing.
Just saw
@Doug Briggs post. Agree. Very smooth, and efficient. Sneaky quick. No wasted motion. No grinding.
I have a daughter who was always hard on her edges. At least a half dozen turns a run. Very hard habit to break. Probably the difference between her being a 45pt skier and a 25pt skier. May have originated with a whole lot of demanding steep freeskiing when she was young.
MS sure is fun to watch. Have witnessed some of that training.