Well, as I said in the other thread, I have this one guy, created on 31 January, who has been connected (as per the bottom of his profile page) for several days now (I'm not sure when he first got connected, because I don't check every day. But the thing is, he is STILL on my Special:Unconnected page (as reported in the other thread).
I experimented this morning by orphaning him and then re-adopting him, to see if that would "shake him loose" from my Unconnected list, but it didn't.