I don't think Eminem killed Drake but he did create a nice distance between himself and the three others. One of the major factors is Eminem has learned how to manipulate his voice with extreme control. Naturally, he sounds far superior than Drake, Kanye, and Lil Wayne.

Wayne has the ability to sound dope but he went for the silly outerspace flow. Kanye is probably the worst vocalist of the three. Drake that new kid with those nasally vocals kind of like how eminem used to have a different voice when he first popped up.