It being a slaver camp says nothing about it being a temporary or permanent camp.
I never did either. I said it was a settlement for
short stays, as in people coming and going, and not staying there for long. With those walls, the camp is obviously permanent. At least untill it has no more strategic use.
Your theory on shells is disproven by their conspicuous lack in ashlander settlements.
Is it really? For one, Ashlander's are nomads, and continually killing your pack animals to make a camp you're going to be breaking up some days or weeks later doesn't really make sense, does it?
You seem to be hung up on something I didn't say - mainly that the camp would be temporary. All I said was that shells aren't signs of "Redoran" architecture; especially since they are known to be used for carrying cargo and peopel alike, and would make excelent housing if killed upon arrival.
They would provide food as well, assuming it has eatable meat.