Why do they call him “Grandmaster” Flash?

“To quickly bypass some exposition that has been covered in previous writing, Flash is accredited with some major innovations to DJing, including: 1) Cue; 2) Slipmats; 3) the ‘Quick-Mix Theory’, and, ultimately 4) Extended beats, 5) turntablism, and 6) rap; 7) the popularising of the technics turntables, and 8) the popularising of conical needles; 9) putting the hands on the body of the record; 10 drawing on records with a crayon; the list goes on.”