I like to think a lot about the timeline after ''Ball of Revenge'', were Katz and Cajun canonically meet, but my first point go more with Cajun and LeQuack.
You see, the term Cajun actually come from a community of descendants of French Canadians that resided in the bayous of southern Louisiana, you can see the influence of this in Cajun's character in things like his background music and his motivation in his introduction episode (this community is good know for their really diverse cuisine).
So, knowing this, LeQuack goes to Cajun in ''Ball of Revenge'' thinking he knows about all this, and even tried to speak french to him, learning then something really awful: Cajun didn't knew about his heritage.
His ''name'' is actually the way those how raise him used to call him, so he always believed it was just a weird but funny name, not a whole culture. His love for cooking? Something that has always be in him, so he never give it half a mind to think it could means something more.
It was hard for Cajun to learn all that, and LeQuack could saw that. The duck is a bastard, but there's always a limit, and he could see a lil of young him in Cajun (more on his background later). Also learning that the fox wasn't even old enough to drink even less deal with a existencial crisis, LeQuack decided to symbolically adopt him.
Sure, the duck also knows little about the community Cajun is, but at least he is a full grown ass man able to help him found a point to start! Something that Cajun really needed, 'cause till this point his life choices just make him end in a stew or underground.
Weremole is also a honorable member in this found family, working like a mix of lil sibling+weird pet for Cajun, at the end of the day, it a weird but cute sceneario for everybody.
This is, till Katz got in scene...
*Do against bad luck with a good heart
