To make gravy place small disposable aluminum pans under a few of the pieces of chicken.
Let the coals get just ashed over.
Remove chicken from the brine. Do not rinse.
In a pie plate or shallow bowl, combine the flour and salt and pepper to taste. Dredge the chicken pieces in the flour, coating completely.
Shake off any excess.
Transfer the chicken to the grill around the Vortex. Cover and cook 45 minutes, rotating the lid every 15 minutes. Check for near doneness (160 F for white meat, 170 F for dark meat) in several places before removing.
Lightly brush the chicken with oil and cook another 2-3 minutes to crisp the skin and finish cooking the chicken (165 F for white meat, 175 F for dark).
Remove to a plate or cooling rack.
For the gravy
Carefully remove the disposable pans containing the drippings.
Don't spill it onto the Vortex or it will flame up. You'll need 1/4 cup of the drippings.
Place drippings into a medium skillet over medium heat.
Sprinkle in the flour and whisk until browned, about 1 minute.
Add milk and whisk until thickened, about 5 minutes.
Season with salt and pepper to taste.
Serve chicken with the gravy and devour.
Notes
I found that bone-on, skin-on chicken thighs make for the best fried chicken but that's just me! Use your favorite cuts!