I don't think she has a strong enough voice to support that back up part. It's just not pleasant here. I think her voice would sound great with folk music.
Love the message, but Kwame's flow just doesn't fit this beat. Kanye's verses become part of the music, Kwame is dominating and the musicality of the beat disappears.
Her soft singing doesn't really fit this uplifting granduous beat, and kwames flow sounds a little off, and forced, I like the message and lyrics though.