Seems like you're kinda missing my point a little. In my opinion, Chadwick played T'Challa to perfection. That's why I don't believe they should replace him, the same way I wouldn't want to see anyone else play Ironman. As far as what brought people to the theater, it being a MCU movie and it being the first superhero movie with a 99% black cast were what drew people to the theater. You're deluding yourself if you think Chadwick was the major draw. He had definitely established himself in Civil War, but his name did not ring loud enough to make a billion dollars. That's ridiculous. And you can go read or watch any review of the movie you want, and you're going to see comments about the rest of the case being as strong or stronger than BP was in the movie. In fact, a lot of people went so far as to criticize it for BP not standing out more. Letitia in particular was singled out as a stand out. In fact, after the movie, people were clamoring to see more of her and hoping they would put her in Spiderman. Lupita's character was liked, but nobody was begging for her to be in more films.