I don't consider Rock an A-list actor but he may get there this year: 5 movies, 1 TV show, WWE champ... He's having his best year ever.
There is nothing wrong with this...guy had a LONG string of films that came into #1 or 2 opening week for years.
Like if you put Rock with Kate Beckinsale..who gets top billing? Rock kind of has no problem doing whatever the role that best suits him...like in the Other Guys with Sam Jackson. Just how he is.