So Chris Johnson did 4.24.
Let’s compare with sprinters who compete at NFL too.
60m indoors / 100m / 40y NFL scout
Trindon Holliday 6.54 / 10.00 / 4.20
Jeff Demps 6.71 (in 2008, no race this season) / 10.01 / 4.24
Jacoby Ford 6.51 / 10.01 / 4.26
Johnson is as fast at 40y (36.58m) as those guys for standing start. We have no clue whether he has the top speed to reach 60m in the same line as them, and the speed endurance to complete a 100m in 10.0.
Anyway, Holliday and Demps have 3.90 intermediate times at 30m (what Chris Johnson can do provided he knows how to use starting-blocks), but Bolt did 3.78 in Beijing…
No contest for Bolt at any distance from 30m…