Seasoning for Chicken & Sausage Gumbo

This brother shows how to make the "seasoning" for a gumbo. He's cool, but obviously he never measures anything, he just goes for how he feels. It seems easy enough, black pepper, garlic salt, garlic powder, onion powder, red pepper for heat, a teaspoon of file. Then he says, "I'm adding two ingredients that I'm not gonna tell you what it is," or how much to put in, but you can go to the store and buy some generic creole sauce to kinda mimic this flavor. He's got a secret and he's not sharing. Period.