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The 40 time is an indication of not just top speed but also acceleration. The whole idea is that once a human is running full speed they can run 10 yards per second. When someone runs a 4.5 for example the .5 seconds is how long it takes them to accelerate to their top speed. Of course there are exceptions to this. Thats why when someone can run a 4.0 they are exceptionally fast and can accelerate well because they run each 10 yards in a second, without having to take the time to accelerate.
Emmitt ran a 4.6, not blazing fast but not really slow either.
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