Fats can have an impact on LDL cholesterol, but which fats? Some fats raise HDL, some LDL, some vLDL. Some proteins and carbohydrates can have the same sort of impact. Some people are affected more than others. What's the commonality in all of these? The liver.
You can trade out the butter and MCT for coconut oil, and by doing so, you are changing out your fat profile. You are giving up the short chain triglycerides and exchanging them for longer ones. Butter has butyric acid (4 carbon chain) and MCT has capric (10 carbon chain) and caprylic acid (8 carbon chain). Coconut will have lauric acid (12 carbon chain). The longer fatty acids cannot be metabolized by normal cells and require liver enzymes. This puts more strain on the liver than the others in most cases. Remember, this is dependent on liver function.