It seems Machine Gun Kelly may had some help in writing his diss record aimed at Rap Icon/Goat Eminem. Per wiki and other outlets the writing credits for “Rap Devil” shows MGK whose real name is Richard Colson Baker and Ronald Spence Jr. as the writers of the record. When searching Eminem’s “Kill Shot” it only list and shows Eminem as the writer for his diss record at MGK.
It seems MGK may have cheated and if the Hip Hop community destroyed Drake for having ghostwriters then the same needs to be done for MGK. Check out the info from Wiki on who wrote what between Eminem and MGK.