In a heavy pot, cook and render fat out of the sausage. Remove sausage from the pot and sauté chicken in the rendered fat. Sauté the rest of the onions with celery, green peppers, garlic and seasonings (thyme, basil, oregano, white pepper, cayenne pepper) in the same pot. Dust with flour (sprinkle about 1-1/2 tbsp. on top of vegetables to thicken and flavor) and cook for five minutes. Add remaining cup of chicken stock, cook two minutes, add sausage and chicken, par-cooked rice, Creole tomato sauce, green onions and 2 bay leaves. Simmer for 30 minutes or less or until done, but not too dry (add a little more Creole tomato sauce if necessary).