The more I think about it, the more I think I'm fully justified in booting him based on what happened with the Boys of Spring voting. That was really, really malicious and personal, and now he comes back, and pretends to be someone else?
Why would I let someone like that stick around, especially when they're simply annoying everyone else?
The only thing I have to say is that if you do decide to ban him, don't tell anyone - even us regulars. He has befriended some people on the main board and I believe they would get a little pissy if they find out. No reason to broadcast the information and chance inflaming the situation further. People may just think he's gone away, and that's much better than publicly announcing his ban. And if you ban him and he comes back again, just do it again before it gets to this level.