I have some very wealthy friends that are a couple. They own a successful business in the Garment industry.
The wife is the creative. She is pretty amazing. The husband is one of the most effective businessmen I've ever encountered. I'd hate to be on the other side of a bargaining table from him.
They are both loved by their employees, and by their business partners.
I seriously doubt that they would have been successful, if not for their respective skillsets, and the deep trust that a marriage brings (many marriages, anyway).
I suspect that one of the reasons for the Disney success, is the trust between the two brothers.