AFAIK, the check is there to make sure we do not use a fill-prefix which
matches paragraph-start. The late-check ensures this without caring where
the guessed prefix comes from, so it covers adaptive-fill-regexp matches on
both the first and second line (and third line for people like me ;-).
In the current code, there is one such test in each branch of the (if
(< (point) to)...) statement. Thus, neither one makes the other
redundant.
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