I think that it's likely that I read about Thompson in Ripperologist which I used to get as a member of The Cloak and Dagger club. It could have been the Criminologist article or from your own writings posted there. He seems like an interesting suspect and just from reading your posts about the four points he becomes a more valid one than many. It appears, after being away from the subject for a while, that some authors consider it sufficient to just fulfill the "well he was alive at the time," criteria. Mann, Bachert, Abberline! etc and then trying to craft a scenario around this fact.
I look forward to reading your book as soon as I get it.
All the best.