Micheal Johnson was a 200m/400m and ran 19.32 after a heavy program which included 400m’s which would be more taxing than 100m/200m program. Bolt actually ran the 2nd 100m of his 200m slower than Johnson. I think the 300m world record would be borderline, but i actually dont think he would beat merritt over 400m. Once the training volume stepped up the 100m speed would surely decrease and the 200m speed would get closer to the 20sec mark.
