Well, bizarre claims of survival always seem to find Bear, anyway.
I am kind of curious (famous last words) about the mentality that drives this kind of thing. I exempt Anna Andersen from this category, even though I don't believe she was Anastasia, because whoever she was, she had an act going that lasted 60 years, and I think that has to be taken seriously as a successful phenomenon.
But what strikes me as odd is the idea that any candidate who surfaced during the 20th century will find some supporters. Indeed, any fake royal from Perkin Warbeck to Naundorff to Michael Goleniewski (even more improbable than Tammet) has had people willing to stake their lives and reputations upon the truth of their claims, in the face of overwhelmingly convincing evidence to the contrary. What drives this?
I'll throw out the first suggestion:
(1) Opportunism. For some of these claimants --- not all --- supporters could reasonably expect some compensation if the claim could have been upheld. Warbeck, certainly. And Naundorff was laying his claim to a going concern for at least part of his life, i.e. there was a Bourbon on the throne of France.
Anyone else?