Alabama Chicken Sandwich

Name: Alabama Chicken Sandwich
Ingredients: Butter, for bun; 1 burger bun; 3/4 cup Roost Pulled Chicken, recipe follows; 1/4 cup Creamy Cole Slaw, recipe follows; 2 tablespoons Alabama White BBQ Sauce, recipe follows; 3 slices garlic pickles; 1 cup kosher salt; 1 cup finely ground black pepper; 1/4 cup cayenne pepper; 1/4 cup paprika; 2 tablespoons garlic powder; 2 tablespoons onion powder; One 3-pound whole chicken; 1 cup mayonnaise; 2 tablespoons jalapeño pepper sauce; 2 tablespoons sugar; 1/2 teaspoon garlic powder; 1/2 teaspoon coarsely ground black pepper; 1/2 head green cabbage, shredded; 1/4 head purple cabbage, shredded; 1 medium carrot, shredded; 2 cups mayonnaise; 1/2 cup prepared horseradish; 1/4 cup apple cider vinegar; 1 tablespoon finely ground black pepper; 1 tablespoon kosher salt; 1 tablespoon granulated sugar; Pinch cayenne pepper