I suspect a combination of fasting, carbs cycling and circadian rhythm restoration activities may do the trick...unfortunately both camps are stuck within their own model. Dr Phinney and Volek are against fasting due to lean mass loss etc. and Dr Taylor's team seems fixated with his magic 800 calorie model.
I think there's also a risk of generalisation, oversimplification, and possibly sales projections for ND shakes.
As I understand it, Dr Taylor's ND trials have had a narrow focus and a specific aim, ie rapid (and safe) weight/fat loss that avoids bariatric surgery and all it's risks. Once ND's complete, then there's still the challenge of a T2 friendly/safe diet and lifestyle. And for that, we're not just a bunch of standard deviant's livers.
So I agree that it'll be a combination.. Which then means finding the best combination that works for an individual. In my case, I'm an LCHF convert. I cut the carbs, lost a lot of weight initially, but then it slowed.. Which from reading information here, I expected. I also noticed some loss in lean mass (according to my scales), but adjusted my diet to include more protein and more exercise. As a result, I've dropped from 100kg at diagnosis nearly a year ago, to 81kg this morning.. And managed to keep 66kg of muscle per my Tanita's reckoning. Then from a Mk1 eyeball in the mirror, that may have involved some redistribution from doing some simple strength, resistance training and more walking.
My diet's been mostly based on standard advice, ie around 1g/kg protein to avoid lean mass loss. If my scales show that dropping, I add a bit more. Everything else has been plain'ol LCHF, and I also think it's something that would fit an updated 'Eat Well' guide.