If PBXVI is in error regarding his resigination, he is in error…that would include his judgement that he believes he’s not in error. Some are coming to this conclusion. With everything PF has done and continues to do, this seems more plausible to me anyway.
Benedict being an ultrasharp scientific theologian doesn’t strike me as the kind of man who would get his basic epistemics wrong or err about free will vs compulsion. He’s just too sharp for those kinds of mistakes, I think.
This said, the wikileaks material about ‘Catholic Spring’ from Hillary campaign is worrying indeed.
As regards Francis’s personal shortcomings vs validity, historical popes have done all sorts of not exactly moral or rational things without being (or becoming) invalid popes. Francis is extreme by 20th-century standards on the point of theological continuity etc., but still timid compared to some of the renaissance, mediaeval or ancient ones in terms of shock value.
Canon law has provisions to allow for a current pope to abdicate his position. Pope Benedict was certainly aware of that. I can’t imagine why some of you think that he was mistaken or “in error.”
Benedict claims he wouldn’t have been able to make the WYD trip, among other things, and the realization made him leave the Chair for a younger, stronger man.
However, there are more and more leaks suggesting external pressure.
A pope could still validly decide that the pressure was too much, as long as it was his own decision, so the reason is not really the problem. Any issue with validity would have to go to Benedict’s mental and emotional frame at the time of his resignation. Or some kind of blackmail.