"Chronicle" Star Cast As New Human Torch?

Michael B Jordan, star of Josh Trank's "Chronicle" has reportedly been cast as the new 2015 rebooted version of the Human Torch in Trank's "Fantastic Four: Reborn" reboot. Jordan has been rumoured for ages and now it seems as though he's been cast, well according to plenty of online and close sources to 20th Century Fox, he's been cast.
In my opinion, Michael B Jordan is a great actor. I loved him in "Chronicle" but I don't know if I can see him playing the Johnny Storm aka Human Torch. It's fine that he's black but it's the fact that names such as Saoirse Ronan, Margot Robbie and Kate Mara have all reportedly read for the role of Sue Storm aka The Invisible Woman. The problem there is that they are all white women. So how is this going to work in the movie? Sue and Johnny are step brother and sister? One of them are adopted? It's a bit annoying because then they'd have to set that all up rather than just do a normal big screen reboot. Hopefully Fox and Trank will make the right decision when it comes to making the film. This version of the much loved superhero family has to work this time around.