Hi Kat,
By reading your response I just have to know if you indeed read the latest Ebringer/Finnish research in which he suggested to use the antibody response to a particular Klebsiella peptide (piece of a protein) as a diagnostic tool. If not you have more then only the artistic talents and should become a researcher yourself, if you did you're mostly right in your conclusions except that I don't rule out that by that time we know so much more about AS that we don't consider it to be one disease any more.
Gerard