Unless this incomplete burn is a sign of poor airflow, it's likely you'd just get less flavor with a more complete burn.Smoking Peterson Navy Flake and wondering if it is normal for the tobacco on the side of the bowl not to burn? Every time I smoke flake I have to push what is on the sides of the bowl in and lightly tamp. I’m using the fold method and wondering if it’s my packing, lighting, or the wrong tobacco for this style bowl.
You'll get the most flavor out of unburned tobacco, technically fully burning everything in the bowl is less than ideal.
As long as you got to smoke the tobacco for a reasonable amount of time and it tasted good, I wouldn't worry about what the leftovers look like.