@Rod9301 from post 176, I don't know if you're an instructor, and advocate suporting the cog with the inside ski, because it's easier to teach intermediates. (COM above)
No, as in not a central focus on any level versus how to deal with the inside ski within the context of fining out balance during a dynamic turn. It applies regardless of level for fast angulated turns where the outside ski leg is fairly far outside with as much force as possible (or whatever you want to call it and from whatever direction, from the skier, pushing up from the ground/snow, weight, weighting, pressure, some combination of gravity, centripetal or centrifugal on an on….whatever. I’ll refer to that as F.)
I am not strictly advocating that as a teaching point, that you always want to balance COM with the inside ski, (which would be a portion of COM as the focus should be on the outside ski).
But there is this part, if your inside leg is on the snow it should be considered in the total, (period/always). That is just the physics of the whole as the inside ski leg and outside ski leg are connected to the body (COM) (period). The period part is my thinking. If period is rejected so be it.
I think the rub in all this seeing balancing on the outside ski as something that can be done 100%. My position is that is a good teaching point, generally something to actively strive for but not complete. It can be refined more to be more accurate. The reason is a skier cannot balance on the outside ski 100% if the inside leg is on the snow. That is due to physics and if you and others disagree we will have to disagree.
You cannot conceptualize balance to the exclusion of physics.
Going 100% is something Ligety can approach but most can’t. Even he most often has the inside ski on the snow. Just what F is being applied to the inside ski varies rapidly throughout the turn. To avoid confusion just say the very top of the turn is not being included here and the same for the transition at the bottom. The F on the inside ski varies greatly as the turn progresses. It can be small or large depending on how the turn is going. There are many factors that may cause weighting on the inside to be more or less for split seconds. The inside F varies from the mechanics of turn itself, from ruts, ice chatter, the outside arm being back a bit, whatever. A “perfect” turn is too rare to bank on. F is never stable, never one value throughout the turn.
It is not possible to teach a specific value for F for a dynamic turn as it would be too hard to manage a constant value if even that could be done. It would be possible to train for 90% outside 10% inside as a rough approximate if that was desired. For the type of turn discussed that is not desirable.
Teaching/training can be done to heighten awareness of the inside ski, understand its action on the total of balance, the Forces that are in play and etc. [Keep in mind COM is connected to the snow in two places.]
Just think about all that fun you're missing out on 
