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I think keeping him at zero income (locking him down with free downvotes) would be enough. He won't go down in rep, but won't go up. And before long, the rest of the field will surpass him, and then be able to crush him.

I did post about allowing lower accounts to affect the higher accounts a long time ago, but unsurprisingly the technocracy didn't like that so I got back in my cage. ;)