I was just going to post what Cataholic did...it's time to start Prozac and re-start the intro process. I applaud you for working with them for so long in what is a truly scary, upsetting situation for both kitties and their people.
I JUST read a really good article on redirected aggression, which you may have already seen since you've been dealing with it for such a long time, but in case you haven't, here it is:
http://www.littlebigcat.com/behavior...-a-case-study/
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