I really do not want to get into a debate on this issue, and I myself am not entirely convinced of one side or the other, but I do want to say something concerning the claim being made here that Fr. Cekada "invented" the una cuм issue. That is simply not true.
I think it was around 2002, long before Fr. Cekada published anything on this, that Fr. Kevin Vaillancourt released a study on this issue, and he came to the same conclusion that Fr. Cekada would come to. The exact title of the study escapes me now, but I purchased a copy of it some years ago. From what I remember about this, I believe it was Fr. Guerard des Lauriers who first brought attention to the "una cuм" issue back in the 1970s.