Authentic New Orleans Cajun Gumbo

Name: Authentic New Orleans Cajun Gumbo
Ingredients: 2-3 pounds, chicken leg quarters; Salt to taste; 1 teaspoon finely ground black pepper; 1 1/4 teaspoons finely ground white pepper; 1 teaspoon powdered mustard; 1 1/2 teaspoons cayenne pepper; 1 1/2 teaspoons paprika; 1 1/2 Old Bay Seasoning; 1 teaspoon granulated garlic; 1 teaspoon file powder, optional; 1 1/2 cups flour; 1 1/2 cups butter; 3/4 cup finely chopped onion; 3/4 cup finely chopped celery; 3/4 cup finely chopped green pepper; 2 cups diced okra; 1 1/2 teaspoon fresh thyme; 1 12 oz can diced tomatoes; 9 cups chicken broth; 1 lb chopped or thinly sliced smoked sausage such as andouille (or kielbasa if you can't find andouille); 1 lb craw fish tails (or shrimp if you can't find crawfish tails); 3 bay leaves; 1 teaspoon finely minced fresh garlic; 2 cups cooked rice; Pinch of File powder for serving; Optional garnish parsley, green onions and Crystal's Louisiana Hot Sauce