I agree with Danny, there's no way you can tell that the abuser really was Jacob. If he was using the names of other people, he might as well have used Jacob's too.
There is a way to tell for sure. Next time this person appears, type /whois theircurrentnick, replacing theircurrentnick with whatever their nickname is at that time. Write down the results and send them to me or Abe Babe.
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