i think because they're doing a reboot of superman and creatinga new batman that fits into this universe, it's nice to see fresh faces on the screen. so what about sullivan stapleton? he has the charisma and bold personality that bruce has, also he's already had experience working with snyder in the new 300 movie. he's tough, confident, and cleans up nicely. for anyone who does not know to whom i am referring to, go and watch the trailer for the new 300 movie, he's one of the main characters.