Yes. Chris Gardner suggests that if insulin resistant people lose better on low carb, but insulin sensitive people can do as well on a higher carb approach, then if you can first address insulin resistance through weight loss, the person could move over to a higher carb diet once they were more insulin sensitive. Woo goes in the other direction--fat cells become more insulin sensitive as well, a person who's insulin sensitive to start with may have a different kind of insulin sensitivity than somebody who gained it through weight loss.

I think another thing to consider here is hypoglycemia. One side effect of weight loss surgery is hypoglycemia--which to me begs the question of whether this hypoglycemia is a new thing for the person involved, or more of a latent hypoglycemia that had been hidden/prevented by the insulin resistance that accompanied obesity.