The tiny, ancient one! My angry, blood drinking child! I honestly can’t wait to see if she’ll shed her prison of flesh and wreck havoc on the whole universe! ACOWAR is so close, I am not ready… at all… help.
(If you're still open to Anti and/or Dark theories, I have one). Jack seems to be (mostly) oblivious to Anti, right? And Mark said that Dark was a separate person who likes to F with people. I think that Dark had a part in Anti going after Jack. I think, in an attempt to get at Mark, Dark called up an agent of chaos and bloody destruction to wreak havoc unknowingly on a guy who doesn't deserve it and is one of Mark's friends.