You keep making that assertion, but never explain why you believe that.
He appears at the same time the bizarre pornbots do. I don't have the ip checking methods available that you do but I'm no fan of coincidence.
That is all you have - coincidence in time. Such things happen. There is no belief in the cave whatsoever by anyone that he has anything to do with the attack here. As Morden said, it seems to be one of our former banned. I think he named a prime suspect.
I don't have the tools the cave has so yes, that's all I have.