I know you can't really compare careers but I wouldn't mind Jojo because she is also very good at the song association game on Elle. It would be nice to both hear them sing.
I can see Ashanti, Toni Braxton, Angie Stone, Mary J Blige
Ciara as far a popularity, but I never got into her music. I also don't know if Amerie and Mya would want to battle Bran. Ashanti is not on her level vocally either but whatever..she could add some tracks she wrote for JLo? ...let Bran shine a bit.
Monica is a no. Too much drama. I'm so over it. They just don't have chemistry together.