The leviathans probably didn't know Frank was working with the Winchesters. They probably just found him because he was hacking so much into their business, so they wouldn't have thought of replacing him.
I had a lot of the same thoughts/reactions as you (as usual!).
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Date: 2012-03-17 05:00 pm (UTC)I had a lot of the same thoughts/reactions as you (as usual!).