Trai Byers

Who is that? Trai Byers might be unknown at this moment, but so was Chadwick Boseman before being cast as Black Panther. So naming Trai Byers as Black Bolt wouldn't be such a surprising move.

Even more, this actor already made a name for himself in the hit series Empire, where he outshines everybody when he is on screen (and maybe if Marvel doesn't cast him, DC will consider him as a Green Lantern "“ he is that good).