If side chain was bitcoingirl.club himself... that would be one helluva twist.
Somehow I don't believe it but... no one can really know.
Why would she/he want to ruin their reputation/profile in such a manner. I mean for a person who has been in the forum for a while, knowing that even if they faked that their profile has been hacked to leak the PMs, the Legendary Account would get tagged right away, get dropped out of a good signature campaign she/he was participating and making trading deals, loan requests would be much harder for the user even after the storm calms down. All that just to prove that LFC_Bitcoin sent PM's to some members and make sidechain the hero?