That's for both the current script direction and the possibility that Mahershala maybe doesn't have a great grasp on the character or world.
I know people in here have already decided they don't like that second take, but honestly I can believe it, and kinda do. I can believe a world in which he's not super up on, into and familiar with not just Blade but superhero content in general, doesn't get it in the same way Wesley got it, but likes the idea of being the lead in a black superhero movie and picking up the torch from BP and Chadwick.
It is very believable.