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Lips get thinner, but not that much thinner. Also, the symmetry of Lucia's and the imposter's mouths are very different. The only natural cause is if Lucia had a stroke or AVM-induced brain hemorrhage. Did she ever have such medical condition?

It appears to me that in order to defend Fatima we do all sorts of interpretation and selective reading and invent two-sister lucy theories, when at face value it is more innaccurate than accurate.

To me, the most damning part of Fatima is the fact that Sister Lucia went along with the modernist changes and slobbered over JP2's hands in the most fawning way in June 2000.  Obviously, the doppleganger theory gets around this which is why it gets traction with some (but not most) Traditionalists, but having studied it I see no credibility or strong evidence for it.  There are unanswered flaws such as why all of the other sisters in the convent did not notice that a person had been swapped out for a doppleganger, or Lucia's family members or indeed what the Church gained by it for the HUGE risk of potential exposure, when compared to simply suiciding sister lucia in 1972 and saying she has died of natural causes.  The doppleganger didn't really do anything.  Sister Lucia simply dying (being killed) would be much less risky and still serve to take the spotlight off Fatima.

While the investigation is not complete, Dr. Chojnowski http://radtradthomist.chojnowski.me/ has already released some evidence that supports the theory that there was an imposter posing as Sr Lucy.  Most people who are already convinced that there was an imposter believe that the switch happened before 1960.  She was not seen in public from 1947 until 1967.  There are no photographs of her for 20 years.  Isn't that odd?  As for her family, she was moved from the Dorothean convent (not cloistered) to the Carmelite convent in 1947.  That is highly unusual.  She took perpetual vows as a Dorothean.  I think it would be highly unlikely that she would seek to be dispensed from those vows so that she could profess new vows in the Carmel.  And conveniently the Carmel does not allow frequent visits from family and friends and when they do visit she would be required to be behind a grate.  If you have seen pictures of the grate, you can see that it is hard to see inside of it.  Dr Chojnowski has uncovered evidence that the Carmel was associated with Opus Dei (another shady organization).  So the whole thing stinks.  Sr Lucy was not in great health in the 1940s.  I would not be surprised if she died in 1947 and Opus Dei took the opportunity to substitute an imposter at that time.  The goal being to suppress the 3rd secret which probably reveals the fake council and the fake popes since Pope Pius XII.