Question: Do some people do well on ketosis because they have defective glucose metabolism?
I doubt that that's the majority of people that feel good in ketosis, but certainly people with GLUT1 defects need to be on a low-glycemic index diet at least, if not a keto diet in order to not have seizures, and that's the best example of what would fit with that. People who do poorly with glucose, maybe in more moderate ways are going to do better on fat.
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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice.