My best guess is that your edge cases are going to come from people who are slightly overweight but still exercising regularly and have an overall healthy diet (as this WebMD page implies -- https://www.webmd.com/diet/features/can-you-be-fit-fat#1). These people may be healthier overall than someone in the "normal" range with a bad diet and sedentary lifestyle.
The main thing I know there's been some recent controversy regarding the health risks of the edge cases of the "overweight" category. (https://www.verywellhealth.com/is-being-a-little-overweight-...).
My best guess is that your edge cases are going to come from people who are slightly overweight but still exercising regularly and have an overall healthy diet (as this WebMD page implies -- https://www.webmd.com/diet/features/can-you-be-fit-fat#1). These people may be healthier overall than someone in the "normal" range with a bad diet and sedentary lifestyle.
Best guess is that this is not the majority of overweight people, though... Exercise statistics in the US are pretty dismal. (https://www.cbsnews.com/news/cdc-80-percent-of-american-adul...).