What do you mean not that many kids know Pete? He is prominent in newer Mickey Mouse related works and cartoons.Villains are a niche market. These have to appeal to families with small kids who might be scared to get in a gondola with Maleficent or the Evil Queen
Pete is cartoonish enough to be non-threatening, and I think young kids don't know who he is, anyway. I have to admit, I myself don't know who Bellwether is.