I think I understand the concept of marking a question or answer as "community wiki" -- it has involved a significant number of people such that it now belongs to "the community" rather than the OP. And I assume answers can be marked by humans or by the system when many edits have occurred. In the latter case, surely the "system correction" should only kick in after a significant number of edits have been made by different users?
For this question, Eastings/Northings OSGB36 Grid origin, I put a lot of work into my answer, making edits/additions stretching over a day or two. There are currently 12 edits to my answer. Candidate for CW? Perhaps. Except that they were all done by me. May I regain ownership?