Anytime! I'm full of recipes (and other things...hush, Don Tomato!).
Why do things like soups, stews, gumbos, and the like get better as they sit? Because it has to do with how the flavors are transmitted. Essentially, most flavors (including salt) are carried best either in oils/fats or alcohol; water can be a carrier of flavor, sure, but it's not always as effective. Either way, when we make things which have some fats in it, as it sits the oils/fats absorb the various flavors and intensifies them as well as melds them together.
So you think how most soups, stews and gumbos start...it's with a fat or oil. Perhaps it's rendering out bacon, sausage or other fatty meat...or it's olive oil or butter. Either way, there's always some sort of oil or fat involved...in moderation. Also, if you add stock or broth, there's inherently a little fat in it.
One more note about gumbo: the leftovers should be frozen or refrigerated separate from the rice...otherwise, the rice soaks up all the broth, and it's a gelatinous mess.
(BTW, flavors that are best carried by alcohol are those which are 'fleeting'...they don't get intensified over time, usually.)