Though it may be a bit of a stretch to say that Mark was in any way ever directly involved with them. He seems to imply that he was not in his SR timeline piece. Why do you think an unknown intern may have been part of any scheme? That's news to me.
He admitted he had been losing BTCs since sometime in 2011 from MtGox's hot wallet via the allegedly "
Transaction Malleability". Given his paranoia with keeping the cold wallet password on himself (not commenting on rumors that he VNC'd
via an UNENCRYPTED connection the "so called" cold wallet of his) I believe he got burned from inside-out. Not ruling out he was acting by himself, but I think it's less possible to be the case.