The Lonious Monk
Celestial Souljah
After RDJ strong armed them, I don't know but we need T'Challa as the center of the MCU post-infinity War.
I think I read somewhere that they wanted to give Strange the Ironman's position as the forefront. The only way they could put T'Chala at the center is if he wasn't king anymore. That's typically how it was done in the comics when he became a key member of the Avengers. They could do that. Maybe have a second movie where he loses his role as king, and have the third movie not really even be a BP movie, but a Wakanda movie. In the interim, BP could be an Avenger and take part in all the Avenger oriented shit.