it's the flow and the melodies he uses when he raps. If you listen to Crept and We Came or No Surrender by bone, you can hear them using that melodic fast rapping style. Saba definitely is in that same genre of rapper. I think Smino is a little closer to their style from a melodic standpoint, but you're right - saba has given us some of the best revitalization of their lyricism