Tha Carter V"Still the motherfuckin' best rapper a live," Lil Wayne offhandedly declares on "Dope New Gospel," a coasting track on which the unmistakable MC also insists that he's irreplaceable, even in death. Claiming supremacy while considering mortality has long been as natural as walking while chewing gum for Dwayne Carter, but there's a greater, grimmer sense across the long anticipated Carter V that life is just a moment. Wayne's mother sets the tone with a