I can not speak to the specific chicken served by KD. I never had it. I ate at KD once decades ago and had a burger, FEH.
BUT from my days in the kosher catering and restaurant business:
The best fried chicken is made in commercial pressure fryers, not in fryolators (The open baskets used for French Fries).
All the major treif chains (KFC, Popeyes, etc.) use this method. In fact we bought our pressure fryers at a bankruptcy auction of a KFC franchise in 1977 and our mashgiach kashered them. Later, we rec'd a letter from KFC corporate attorneys warning us to remove all KFC marking from the equipment, something our rav hamachshir had done to avoid the problem of marit ayin.
There are many recipes on the web for making pressure fried chicken at home in a 'home' pressure cooker.
You will not get the fast food experience you seek by making fried chicken at home in a frying pan or electric skillet, no matter what ingredients, brining, etc. you use. Equipment is crucial.
I've attached a picture of what the commercial equipment looks like.
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