I read a novelization of the live of Dumas that was written in the 1950’s. It was entitled “The King of Paris.” When reading it, I piduted James Earl Jones playing the part of Dumas, but only because of the way that Dumas was portrayed in novel. There is no reason the part has to be played by either a white man or a black man. Can’t just get past this race thing? The craft of acting is to be able to pretend to be someone else. Charleton Heston is not Jewish, but he played Moses and Judah ben Hur. Omar Shariff is not Russian, but he played Dr. Zhivago.
Dumas was a quadroon, which made him 1/4 black. I see no issue here.