Update - 6:25 GMT
It seems this isn't the real OMF42, but a faker who mislead us all. Thanks to Franech Johilan and ChristyG for letting us know in the comments. I still think it was quite interesting, though, and kept us occupied for the weekend.
Thanks to torched for the heads up on what went down in the chat last night.
It seems OurMutualFriend42 is giving us more and more clues, hopefully Dark can confirm that this is the real user and not a faker.
Do you think we're on the right track? Speculate in the comments below.