I added a comment to this thread:
But it did not rise to the top of the discussion list. This is too bad, since I've found a legitimate reason to re-open the discussion.
Again, I would urge the admins not to use thread-sinking at all; but if you must, do it in the open with a post explaining your reasons. And please, just because you think an issue might be closed, there may very well be good reasons to keep it open.