I agree with being a little out there, lol
An interesting theory, i have to admit, but you see my friend everybody has a tell, one thing, a crack at their outer walls that give us a glimpse of what the person really is, if Mrs Hannigan was a madam then we would have had a little bit of hinting pointing to it, still a solid theory.
I have another one, Kelly, the girl Alan is seeing, she's the prostitute or directly involved with the ring, it just came to me while i was typing out this reply, i'll have o think further on it to get the details as to how would it be possible.