There’s a sort of pleasing symmetry in that fact that Black Panther the character started off as a Fantastic Four side character (I was really surprised to learn that) and THEN the Fantastic Four movie, even if it was a flop, helped establish Michael B Jordan as a big name and opened the door to him playing Killmonger in Black Panther, which he’s getting rave reviews for
(And that now, the Fantastic Four themselves are pretty much side characters in the wider Marvel-movie-verse and Black Panther is the star.)