My understanding is that a downhill run reduces the impact of a poorer corner exit. Derek Bell talks a bit about this while narrating his lap of the Nurburgring from 1983 on "In-Car 956". Also, with that example from Spa, you can see it with your own eyes that the gap generally doesn't open up as much as you'd likely suspect from coming off a corner as slow as La Source.
Beyond that, as I talk about, it's a compression AND expansion zone, so the corner entry plays into it as well.
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