Duplicated questions are a thing we want to avoid on these sites. However, it will happen anyway, this is why we get the "exact duplicate" close reason.
There are some questions which are coming back frequently, and they are closed as duplicate of an initial one, usually. For questions which are coming back the most, it could be good to take over the original question to improve it (because often it was badly asked, compared to a duplicate, which is finally a bit silly, but it has the most answers). Eventually, it could be nice to even make some CW, so that they become references.
Besides the fact of "Is it a good idea to take over a question someone else asked, for the greater good?", there is the question of "how to find these?". I know that so far, the link to duplicate is only included in the question, which is potentially editable, so it's not a solid reference.
Besides this constraint, is there a way to find which are the questions which are the most referred to in a duplicate context?
I know it is not possible with the current search tools, but maybe it could be with a data dump? As a further idea, would this have an interest in being formalized (like for example including the main duplicate link to the close description), and eventually have a "top duplicates" accessible in moderation tools?