I'm open to considering any theory but I'm not really sure what you are implying on this one.
The original Aunt Viv was the dark skinned woman and as Will Smith said, she was the better actress of the two.
Any situation will hace some complexities to it; I'm not alleging she was perfect. However, I think they replaced her with a light-skinned woman purposefully. I really appreciate you reading and I hope your have an incredible weekend.