I am grateful they did, but I have no idea how Nickelodeon executives took a look at the work of the guys who made Johnny the Homicidal Maniac and Squee and said, "yep, these are the guys who should make a cartoon for us."
it's the artist(s) that pitch the show using a pilote épisode. If past work didn't even hinder the guy who made fritz the cat to work on kid shows, Nothing will.