wayne but only on certain codeine fueled songs.
like me and my drank and prostitute flange.
melody over clarity.
future evolved it. keef evolved it.
i don't know why uzi, 21, kodak, yachty, or any of them got called mumble rappers. they came up with that term because they couldn't rap and the "aye/yeah/etc" was always at the end of their sentence. but you can understand all of them. mumble rap wasn't about understanding them - it was making fun of their lyrics.
wayne, keef, desiigner, gucci, thug, future, migos actually mumble. they're mumble rappers and all follow in wayne's footsteps.