Some of those responses, Ambrey, are actually just being realistic or sensible, and are often a heck of a lot more sensible than the speaker realizes. When you insist ad nausea that something far fetched is true, and MUST be true, you can expect someone to speak up occasionally.
Your tune keeps sounding like different songbirds. At first, we heard that we had to get on board that the GP draft cross was not for the sake of YOUR GP draft cross or your oft stated wishes to advance with your horse, but for the GP draft cross for a young lady you cared deeply about, who had a draft cross that you didn’t want anyone saying anything discouraging to this sensitive young girl about, but only you seemed convinced the horse had to get to GP for the world to be happy, right and just - the poor kids heart would be broken unless we here on this bulletin board agreed with you that ‘the sky is the limit! follow your dreams!’ Now we’re hearing your horse makes you happy, and that’s all he has to do to be a star. I recall you saying your purpose here was to be a sort of intellectual gadfly and shake people out of their preconceived notions and challenge them to far more noble thought processes. Does that mean they should also ignore facts and common sense?
‘Look how Sparky piaffes’ when Sparky is actually trying to get a leg strap out from between his butt cheeks just tends to get a fairly skeptical response.
Your horse isn’t all that likely to asphyxiate himself unless he hangs around at certain parties, and I don’t think that’s what any one here has said; you like to twist things you hear that you don’t like, to make them seem absurd and then discount them.
It’s only commonsense that a horse with a thick throatlatch and less room behind the cheek has a harder time becoming supple in the throat, but people’s eye and their concepts about what conformation works, and their endless focus on the horse’s head and neck, is often part of a much larger blindness and lack of experience, and the lack of having an eye to see the differences between various horses especially overall balance and in motion.
The horse’s neck is one of the supplest parts of his body, even the worst of necks is more supple than the hind quarters, which are limited by conformation and how they connect to the back and what the back is; the neck and head are not irrelevant, but there are much bigger things holding most horses back from GP dressage. A horse, a dressage horse, does not coast around on his neck. He fails or succeeds on his back and his hind quarters, and how these parts of him connect together and work together.
A little loose skin or a cresty neck isn’t going to be anywhere near as much a problem as the steeply sloped croup, cow hocks, long back, immense mass around the shoulders, deep, heavy girth line, low set neck with an immense amount of mass, short front legs, cow hocks, tiny, narrow, weak hind quarters, completely incorrect overall proportions, crooked legs and feet, or the many, many other traits that hold horses back from developing advanced collection and prevent them from being able to withstand years of daily riding.