Thanks for posting this letter. I don't pretend to understand the half of it but I wish this question was seriously addressed. I don't have an unshakeable confidence in the NO sacraments and rites because they have messed with everything. I wouldn't even be surprised to hear that there is a committee in Rome right now working on a change to render even baptism in doubt and that would take some doing, since baptism is so easy a pagan can do it!
I do remember hearing that +Tissier completed a book length study on this very subject of the validity of NO episcopacy/priesthood. Does anyone know if it was ever published??
Luke