I don't give a fukk about Mexican Namor. The aesthetic seems to work. They should've recast T'Challa. Movie is done so I'll wait for the reviews and see if they can reconcile this mess of logical story continuity that they are about to unleash before I go see it.
Phase 4 has been lukewarm, and of all the layups they should've had for their franchises, BP2 could've been the easiest one. There's no clear leader for the MCU and it was apparent T'Challa was being set up to fill that Tony Stark void.
I'm not insensitive to how the cast is feeling or Chadwick's legacy. If they really felt he couldn't be replaced, they shouldn't have continued the franchise. Seems ass that the crew has taken that position, but will still move forward to get a check cut.