Cardinal Oddi - Elvis sighter
"It [the Third Secret] has nothing to do with Gorbachev. The Blessed Virgin was alerting us against apostasy in the Church." Il Sabato 03-17-1990
Cardinal Ciappi - dreamer, denier of reality and personal theologian to JPII
"In the Third Secret it is foretold, among other things, that the great apostasy in the Church will begin at the top." letter to Professor Baumgartner in Salzburg
I could post an entire page of quotes from people who claimed to know what was in the secret. Cardinal Oddi said lots about the Third Secret-most of it speculative. Did he read it? I've read claims that not even Pius XII read it.
On another occasion, Oddi had this to say about the third secret:
At this point let me advance a hypothesis: that the Third Secret of Fatima pre-announces something terrible the Church has done, naturally without meaning to. That because of mistaken interpretations, disobedience, or something similar, the Church has passed through a moment that was too difficult. Nevertheless the secret says that by the year 1960, in spite of the best intentions, the church would have done something whose consequences were very painful, with a tremendous decline in religious practice. And that later, following a great suffering, the Faith would return. Yes, this may be the content of the secret. But if this were true, the fulfillment of the secret has already been observed, for the crisis in the Church is visible to all. And the most alert souls recognized it years ago". Reference
It sounds like pure speculation on his part, to me.
As a rule of thumb regarding the Third Secret, those who knew, didn't talk and those who talked didn't know.