Its not about who would care or wouldn’t care its about contracts, scheduling, and availability. If he’s signed on for sequels to Aqua-Man and any additional appearances in the DCEU then that could conflict with filming & promoting Black Panther 2. Remember making movies, ESPECIALLY big tent pole blockbusters, is a much more intensive and calculated business than pointing at an actor and saying “HE’S PERFECT!” And shyt just goes into production. Daniel Kaluuya had to drop out of BP2 due to filming NOPE, and he wasn’t even a main character. Thats why you rarely see these big budget movie star actors crossing over into other big budgeted movies because scheduling is hell
I dont see his character being a main stay in Aqua man, he might as well sign now (theoretically) so he can be killed off lol. Then ramp up for post BP2