Not all of Don Bluth's films are owned by Disney, MGM, or Universal. They're owned by various companies. Therefore, the Don Bluth category should not go in these company categories.
Topic on User talk:Kiki2002
Stop putting the Don Bluth category in the company categories
TBH, I find the idea of adding a category to a category pretty bizarre.
I mean, if it’s something like adding the 20th Century Studios category to the Disney category, then that makes sense.