this is c00n talk, black panther literally killed the pro-black voice in the film.You can say this forever, because you never defined what "pro-blackness" actually is.
You noted that ownership is part of it, but you have yet to acknowledge notable parts of black arts and culture that aren't necessarily "owned" wholly by black people. (Who owns the rights to Public Enemy,
Your OP is also incorrect in saying "not a black hand was involved in its creation" when not only the cast, director, costume designer and production designer are black--but one of the executive producers of this film and Civil War is black (Nate Moore).
Basically, as long as there are non-Black people involved in making this movie, you allow yourself to keep moving the goalposts.
The ownership of the Black Panther character and universe is inconsequential to its cultural importance to Black people, and it's strange that you're trying to argue that films like these both benefit and provide opportunities for Black people.