Every. Single. One.... was one I had thought of. All of 'em. His favorite theory matched my planned plot arc almost exactly.
As you might imagine, this leaves me with a dilemma. Do I shuffle stuff around, trying to come up with a new main antagonist and hoping to confound him, or do I leave it as it is and end up explaining "No, I didn't steal your idea. That's what I already had planned."
Kinda skeeves me off. :-)