Actually, Nos and I discussed this when I asked him if he'd have joined the game had he found out about it earlier, which is when I asked him about controlling the villains as well.  I had hoped this would end up being a surprise to everyone but him and me, but - since it was brought up, the main villain, who may jump realities, is the reason the multiverses converged and, therefor, the one who brought the group together.