This question How do you prove that $n^2-1$ is composite when $n>2$? was closed as a duplicate. That was the right outcome, as opposed to, you know, "off-topic."
But the question it's a duplicate of is closed! Prove that there doesn't exist any integer $x \ge 3$ such that $x^2-1$ is prime. At least it does have one answer, but that answer, as obvious as it might seem to most of us, is borderline impenetrable to the site's more casual visitors.
Not that the closed question's asker would care one way or the other, but I think other people who happen to come across either of these pages would appreciate one of them having a slightly elaborated answer.
I'm not proposing that duplicates should automatically reopen closed questions, that would probably lead to more questions that should be closed as duplicates being closed for some silly reason instead.
What I'm asking is: does there exist the possibility, on a case-by-case basis, to reopen a closed question if it's identified as the original for a duplicate question?