Nah my coach works with the Manly Sea Eagles. The fastest over 20 (so far) has been David ‘Wolfman’ Williams, but Brett Stewart has the highest top speed (back before he buggered up his knees).
Good point above about the energy spreading - plus, Bolt may have run faster 20s in his lifetime, which may well have been down in the low 2.8s/high 2.7s depending on his start.
Does anyone know what Ben did over 20? Surely he would have been a genuine 2.6-2.7 runner even when reacting to the gun.