I’ve suspected this as a component as well. @KetoLikeaLady is definitely a very interesting case given the excellent insulin control, dietary quanity, and the activity level. Typically, one of these three is in play as the show-stopper if there isn’t another underlying obstacle like thyroid (we addressed that earlier).
The biochemist theorizer in me wonders if there’s a mechanism like “adipose hyperabsorbtion” or some such. Maybe it’s endocrine-based on the hormonal side. Somehow the subcutaneous fat is actually more practive than average at binding in trigs on a per-LDL ratio, which likewise reduces its availability to muscle tissue. But again, this would be a subtle difference.